where a range of values is provided , it is understood that each intervening value , to the tenth of the unit of the lower limit unless the context clearly dictates otherwise , between the upper and lower limit of that range and any other stated or intervening value in that stated range is encompassed within the invention . the upper and lower limits of these smaller ranges may independently be included in the smaller ranges is also encompassed within the invention , subject to any specifically excluded limit in the stated range . where the stated range includes one or both of the limits , ranges excluding either both of those included limits are also included in the invention . unless defined otherwise , all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs . although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention , the preferred methods and materials are now described . it must be noted that as used herein and in the appended claims , the singular forms “ a .” “ and ” and “ the ” include plural references unless the context clearly dictates otherwise . for example , “ a fungus ” also encompasses “ fungi ”. as defined herein , the term “ modulate ” is used to mean to alter the amount of phytopathogenic , bacterial or fungal infection , plant pest infestation or rate of spread of phytopathogenic bacterial or fungal infection or plant pest infestation . anthraquinone derivatives include but are not limited to physicion , emodin , chrysophanol , ventiloquinone , emodin glycoside , chrysophanol glycoside , physcion glycoside , 3 , 4 - dihydroxy - 1 - methoxy anthraquinone - 2 - corboxaldehyde , damnacanthal . these derivatives share a similar structure as follows : where r1 , r2 , r3 , r4 , r5 , r6 , r7 and r8 are hydrogen , hydroxyl , hydroxylalkyl , halogen , carboxyl , alkyl , alkyoxyl , alkenyl , alkenyloxyl , alkynyl , alkynyloxyl , heterocyclyl , aromatic , or aryl group , sugars such as glucose ; in a particular embodiment , the invention is directed to anthraquinone derivatives that are contained in extracts derived from plant families including but not limited to polygonaceae , rhamnaceae , fabaceae , asphodelaceae , and rubiaceae . these compounds can be isolated or obtained from any part of plants such as leaf , stem , bark , root and fruits . plant materials can be wet and dry , but preferably dry plant materials . to meet the biochemical agricultural products , solvents and processes that are used in the extraction and purification must meet the requirements of national organic program ( nop ) [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. in a more particular embodiment , the plant extract is derived from a member of the polygonaceae family . as defined herein , “ derived from ” means directly isolated or obtained from a particular source or alternatively having identifying characteristics of a substance or organism isolated or obtained from a particular source . in a particular embodiment , extract in said combination contains at least one anthraquinone derivative such as physcion and optionally emodin . members of the polygonaceae family include but are not limited to acetosella , antigonon , aristocapsa , bilderdykia , brunnichia , centrostegia , chorizanthe , coccoloba , coccolobis , coccolobo , corculum , dedeckera , delopyrum , dentoceras , dodecahema , emex , eriogonum , fafopyrum , fagopyrum , fallopia , gilmania , goodmania , harfordia , hollisteria , koenigia , lastarriaea , mucronea , muehlenbeckia . nemacaulis , oxyria , oxytheca , perscarioa , persicaria , pleuropterus , podopterus , polygonella , polygonum , pterostegia , rheum , rumex , ruprechtia , stenogonum , systenotheca , thysanella , tovara , tracaulon , triplaris and even more particular embodiment , the extract may be derived from a reynoutria ( alternately referred to as fallopia ) sp or rheum species . in a most particular embodiment , the extract is derived from reynoutria sachalinensis . in yet a more particular embodiment , percent concentration of anthraquinone derivatives in these formulations follows a range of between 0 . 001 to 99 . 99 %. in a specific embodiment , the concentration range is between about 0 . 01 to 95 %. the concentration is preferably between about 0 . 01 % to about 45 %. anthraquinone derivatives naturally exist in some plants , fungi , lichens , and insects . as noted above , in plants , they are present the different families such as polygonaceae , rhamnaceae , fabaceae , asphodelaceae , rubiaceae and others [ subash c . verma , narendra p . singh , arun k . sinha , determination and locational variations in the quantity of hydroxyanthraquinones and their glycosides in rhizomes of rheum emodi using high - performance liquid chromatography , journal of chromatography a , 1097 ( 2005 ) 59 - 65 ]. anthraquinone derivatives widely distribute different plant tissues such as leaf , stem , bark , root and fruits . physcion , as an example , exists in many herbs such as chinese gooseberry ( or kiwi fruit , actinidia chinensis planch ), abrus herb ( abrus cantoniensis hance ), shan ma gen ( boehmeria tricuspis hance ), coffee senna seed ( cassia occidentalis l . ), cassia seed ( or seed of sickle senna cassia obtusifolia l . ), senna leaf ( cassia angustifolia vahl . ), leaf of ringworm senna ( cassia alata l . ), common dysosmatis rhizome and root ( dysosma versipellis hance ), bai ba jiao lian ( dysosma majorensis gagnep . ), herb of tree clubmoss ( lycopodium obscurum l . ), medicinal indian mulberry ( morinda officinalis how ), root of thatch screwpine ( pandanus tectorius soland ), he shou wu ( polygonum multiflorum thunb ), ji xue qi ( polygonum amplexicaule ), xue san qi ( rheum likiangense san . ), xi zang suan mo ( rumex patientia l . ), mao mai suan mo ( rumex gmelini turcz . ), niu she cao ( rumex dentatus l . ), suan mo ( rumex acetosa l . ), hu zhang ( polygonum cuspidatium ), tu da huang ( rumex obtusifolius l . ), ta huang ( rheum nodile hook . ), yang ti ( rumex japonicus houtt . ), root of oriental buckthorn ( rhamnus crenata sieb . ), qian cao ( rubia cordifolia l . ), da feng yao ( rhamnus napelensis wall . ), stem of sargentgloryvine ( sargentodoxa cuneata oliv . ), snow lotus herb ( saussurea laniceps hand .) and so on [ chinese herb database http :// www . temlib . com / cited on jul . 20 , 2009 ]. anthraquinone derivatives can be extracted from plant materials by any inorganic or organic solvents which are allowed to use by national organic programs [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. for example , these materials can be ground and then extracted with a base solution , then acidified by an acid solution and finally extracted by organic solvents such as ethyl acetate , butanol ; or ground materials can be directly extracted with organic solvents such as ethanol , or ethyl acetate ; or any other method and their combination to extract anthraquinone derivatives from plant materials . the extraction solution is then concentrated or dried under vacuum with an appropriate temperature such as 20 - 100 ° c ., preferred to 30 - 70 ° c . depending on extraction methods , extracts containing anthraquinone derivatives may include from very water soluble compounds ( e . g ., free sugars , glycosides , acids , amine acids and others ) to very hydrophobic compounds ( e . g ., chlorophylls , long chain fatty acids , anthraquinone derivatives and others ). the physical properties of these extracts may lead to problems for traditional oil - based formulations because hydrophilic compounds cannot dissolve in oil , but in water , and hydrophobic compounds cannot dissolve in water , but in oil . in addition , limited oils are allowed for organic farming [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. only extracts which was extracted with hydrophobic solvents such as ethyl acetate or butanol are suitable for oil - based formulations such as emulsifiable concentrate ( ec ). therefore , powder and water - based formulations are the best choice for any extracts . water - based formulations include suspension concentration ( sc ), microemulsion ( me ), nanoemulsion ( ne ), soluble liquid ( sl ), emulsion in water ( ew ), ready - to - use ( rtu ) and microencapsulate or nano - encapsulate formulation . powder formulations include but are not limited to water soluble powder ( wsp ), water dispersible granules ( wdg ) and water dispersible tablet ( wgt ). to easily compare with milsana ® sc , dry ethanol extract powders of giant knotweed polygonum sachalinense is used in all following formulation examples . suspension concentrate ( also referred to as “ sc ”) is defined as a stable suspension of solid particulate active ingredients in a liquid intended for dilution with water before use . the formulation may contain active ingredient , antifreeze , dispersant , stabilizer , water and others such as antimicrobial , antifoaming ingredients . physcion and emodin are the major technical active ingredients in dry ethanol extract powders of giant knotweed polygonum sachalinense . their melting points are over 200 ° c . and they are very stable in water . therefore , based on active ingredients , knotweed ethanol extract is suitable for sc formulation . water - miscible organic solvents could help to dissolve some of hydrophobic compounds and solved problems about the aggregation or big particles . basically , all water - miscible solvents from allowed substance lists in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] is possible unless phytotoxicity is shown at the highest recommended application rate . such solvents include but are not limited to alcohols , which may include but are not limited to c2 - c7 aliphatic alcohols ( e . g ., ethanol , isopropanol , glycols ( e . g ., propylene glycols ), acids ( e . g ., acetic acid , propanoic acid ) and lactones ( e . g ., gamma - butyrolactone ). the maximal percent content of the water - miserable organic solvent in sc should allow maximal hydrophobic compounds to dissolve , but not produce phytotoxicity at the highest recommended application rate . the active ingredient in such a formulation follows a range of 0 . 001 % to 90 %, preferably 0 . 01 % to 45 %. the preparation may be optimized by adjusting ethanol amount . percent weight of ethanol was investigated at 1 , 2 , 4 , 6 , 8 and 10 % in the final formulation . based on physical properties of final formulations such as suspended particle size and precipitation , the formulation with 10 % ( w / w ) ethanol was the best formulation . a microemulsion ( also referred to as “ me ”) is a thermodynamic stable emulsion that is clear because the individual droplets of the dispersed phase are less than 100 nanometers in diameter . the composition of me generally consists of active ingredients , antifreeze , co - solvent , surfactants , water and others such as antimicrobial agents . the active ingredient ( s ) for such a formulation is ( are ) within a range of 0 . 1 - 50 %, preferably 1 - 30 %. antimicrobial agents can prevent microorganisms from growing in the me during storage . any chemical listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] is suitable for such purpose . for example , bicarbonate salts , carbonate salts , propionate salt , sorbate salt , benzoate and so on . the amount of the antimicrobial agents follows a range of 0 . 1 to 15 %, preferably 2 - 10 %. the antimicrobial agent may be a chemical pesticide and in particular may a multi - site non - inorganic , chemical fungicide selected from the group consisting of chloronitrile , quinoxaline , sulphamide , phosphonate , phosphite , dithiocarbamate , chloralkythios , phenylpyridin - amine , cyano - acetamide oxime . alternatively , the chemical pesticide may be an insecticide or antibacterial agent that includes but is not limited to carbamates , organophosphates , cyclodiene organochlorides , phenylpyrazoles , pyrethroids , pyrethrins , neonicotinoids , nitroguanadines , nicotine , spinosyn , glycosides , juvenile hormone analogues and other insect growth regulators , pyridine azomethine , pyridine carboxamide , tetrazine , thiazolidinone , 2 , 4 - diphenyloxzoline derivatives , organotin , pyrrole , buprofezin , hydramethylnon , naphtoquinon derivatives , pyridazinone , phenoxypyrazole , tetronic acid , carbazate , rotenone , organochlorine - diphenylaliphatics . the antimicrobial agent may be a biopesticide derived from a microorganism such as streptomyces , burkholderia , trichoderma , gliocladium or may be a natural oil or oil - product having fungicidal and / or insecticidal activity ( e . g ., paraffin oil , tea tree oil , lemongrass oil ). antifreezes are generally alcohols ( e . g ., isopropanol , butanol , glycerin or glycols such as propylene glycol ), and sugars ( e . g ., glucose ), which are listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. however , antifreezes are not limited to these chemicals . any chemical with low toxicity , especially natural chemicals , are suitable for this purpose . the percent content of antifreezes in me depends on chemical properties , generally at a range of 0 . 1 - 15 %, preferably at a range of 2 - 8 %. co - solvents help to dissolve the active ingredients . they are generally alcohols including but not limited to c2 - c7 aliphatic alcohols ( e . g ., ethanol , isopropanol , butanol , hexanol ), ketones and esters ( e . g ., glyceryl triacetate , gamma - butyrolactone ), which are listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. however , co - solvents are not limited to these chemicals . any chemical with low toxicity , especially natural chemicals , are suitable for this purpose . the percent content of co - solvents in me depends on chemical properties , generally 0 . 1 - 20 %, preferred to 1 - 15 %. a combination of surfactant would help to stabilize microemulsion . generally , the combination includes a nonionic surfactant and an anionic surfactant or cation surfactant . generally , hydrophile - lipophile - balance ( hlb ) of any surfactant combination listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] falls within 13 to 40 is suitable for this purpose . these surfactants , for example , include but are not limited sulfate salt , phosphate salt , ethoxylated alcohols , ethoxylated fatty acid esters , ethoxylate phenols , ethoxylated fatty acids and so on . in a particular embodiment , the surfactant is at least one of 2 -[ 2 -[ 3 , 4 - bis ( 2 - methoxyethoxy ) oxolan - 2 - yl ]- 2 -( 2 - methoxyethoxy ) ethoxy ] ethyl hexadecanoate or sodium lauryl sulfate . the amount of the combined surfactants follows a range of 0 . 1 - 50 %, preferably 10 - 40 %. soluble liquid ( also referred to as “ sl ”) ( or soluble concentrate , also referred to as “ sc ”) is a uniform liquid formulation . active ingredient ( s ) is ( are ) dissolved in a liquid solvent ( especially in water ) with / without the aid of co - solvents and surfactants . the concentrate is then diluted with water when applied . most of the anthraquinone derivatives ( e . g ., physcion , emodin , chrysophanol , ventiloquinone ) used in the composition of the present invention possess one or multiple hydroxyl group on aromatic rings , which make the deprotonation easily under a basic condition . after forming salts , these anthraquinone derivatives would possess higher water solubility . deprotonized anthraquinone derivatives such as emodin and physcion are still very active and they are stable in basic conditions . the content of the active ingredient ( s ) follows a range of about 0 . 001 - 80 %, preferably 0 . 01 - 45 %, more preferably about 0 . 02 - 25 %. the bases include but are not limited to carbonate salts ( e . g ., sodium carbonate , potassium carbonate etc ), hydroxide salts ( e . g ., sodium hydroxide , potassium hydroxide and so on ). any allowed basic chemical allowed to use by nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] that can deprotonate phenol hydroxyl group or form a salt with them will meets this purpose . the content of the base follows a range of about 0 . 1 - 10 %, preferably about 0 . 2 - 5 %. co - solvents for such a formulation are water miscible solvents such as alcohols ( e . g ., ethanol , isopropanol ), acids ( e . g ., acetic acid , propanoic acid ) and lactones ( e . g ., gamma - lactone ). in a particular embodiment , it is a c2 - c7 alcohol or glycol . any water miscible solvents listed in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] are suitable for this purpose . the content of the co - solvent follows a range of about 0 . 1 - 20 %, preferably about 0 . 1 - 15 %. surfactants may be any dispersant allowed to use by nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. the dispersant includes but is not limited to humic acid , vanisperse cb and so on . surfactants for such a formulation can be those with high hlb values , generally over 12 , preferably over 13 . any surfactants allowed to use by nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] are suitable for such a purpose . these surfactants , for example , include but are not limited sulfate salt , phosphate salt , ethoxylated alcohols , ethoxylated fatty acid esters , ethoxylate phenols , ethoxylated fatty acids and so on . the amount of surfactants follows a range of 0 . 5 - 35 %, preferably 3 - 8 %. ready to use ( also referred to as “ rtu ”) is a formulation that is very low in concentration , used without dilution or mixing . it can be a solid ( e . g ., bait ) or alternatively a liquid , frequently applied via a trigger sprayer bottle . liquid rtu usually uses water as a carrier . rtu can be any one of the formulations such as me , sl , sc and so on . the composition of such a formulation is similar to me , sl or sc as described above . antimicrobial agents can prevent microorganisms from growing in the rtu during storage . any chemical listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] is suitable for such purpose . for example , bicarbonate salts , carbonate salts , propionate salt , sorbate salt , benzoate and so on . the amount of the antimicrobial agents follows a range of 0 . 001 to 2 %, preferably 0 . 01 - 0 . 5 %. stabilizers can be any chemical listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] that can stabilize anthraquinone derivatives in the water . it includes but is not limited to water miscible solvents such as ethanol , or inorganic salt such edta or any surfactants listed in allowed substance in nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ]. the amount of the stabilizer follows a range of about 0 . 001 to 2 %, preferably about 0 . 01 - 0 . 1 %. surfactants for such a formulation can be dispersants or any surfactant with high hlb values , generally over 12 , preferably over 13 . any dispersant or surfactant allowed to use by nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ] are suitable for such a purpose . these surfactants , for example , include but are not limited sulfate salt , phosphate salt , ethoxylated alcohols , ethoxylated fatty acid esters , ethoxylate phenols , ethoxylated fatty acids and so on . the amount of surfactants follows a range of 0 . 001 - 1 %, preferably 0 . 01 - 0 . 5 %. wsp is a powdered concentrate that can directly dissolve in water and result in spraying solution . plant extracts containing anthraquinone derivatives may be formulated in a similar manner as with soluble liquid ( sl ) formulation except that solid carriers instead of water miscible co - solvent are used . solid carriers are water soluble such as bicarbonate , carbonate and dextrins . these are the formulations that use carriers ( e . g ., kaolin , light calcium , white carbon black , silica soil algae ) to absorb or stick the active ingredients , and use dispersants and other adjuvants to help disperse in water , resulting in spraying solution . this is a liquid concentrated form of pesticide that is mixed with water to create a spraying solution . when anthraquinone derivatives from plants are extracted with hydrophobic solvents listed in allowed substance by nop [ http :// www . ams . usda . gov / amsv1 . 0 / nop , cited on jul . 20 , 2009 ], the extracts can be formulated as ec . hydrophobic solvents include but are not limited to butanol , hexanol and ethyl acetate as well . the examples below are presented to describe preferred embodiments and utilities of the invention and is not meant to limit the invention unless otherwise stated in the claims appended hereto . preparation of 5 % reynoutria sachalinensis sc product ( hereinafter referred to as “ 5 % mbi sc product ”: a ) 50 gram of dry knotweed ( reynoutria sachalinensis ) ethanol extract is homogenized in 100 gram of denatured ethanol at 600 rpm for at least 5 min , b ) 378 gram of calcium nitrate is homogenized in 463 grams water for at least 5 min at 600 rpm ; c ) a and b are combined and then the mixture is homogenized at 2500 rpm for at least 5 min . at the end , the temperature of final formulation was about 44 − 50 ° c . dispersion and stability of new 5 % sc was evaluated at 200 - fold dilution with standard hard water ( note : 200 - fold dilution is recommended application rate ). there was negligible insoluble precipitate (& lt ; 1 % of the total dry solid ). storage test at 4 ° c . and 54 ° c . for 2 weeks showed that there was a small layer of precipitates under the bottle , but this layer would be suspended again by slightly shaking the bottle . however , unlike the 5 % reynoutria sachalinensis sc , prepared using procedures described in u . s . pat . no . 5 , 989 , 429 and marketed as milsana ® from khh there was no aggregation and no big particles observed . there was no nozzle blockage when applied with 5 % mbi sc product . the cucumber plants were 2 - week old when treated . the first true open leaf was actively growing in all plants . milsana ® from khh at 200 - fold dilution was used as a positive control . five different batches of 5 % regalia ® sc samples were evaluated at 200 - fold dilution . treatments were prepared in water containing 0 . 02 % ( v / v ) nu - film p . treatments were applied using a 2 oz mist sprayer . each plant was treated 3 . 5 - 4 ml ( 2 . 5 - 3 ml for upper side and 1 ml for lower side ). three hours after treatment , all plants were inoculated with a fresh conidial suspension of approximately 8 . 4 × 10 5 conidia per ml suspended in water . the number of powdery mildew lesions was determined 7 days after treatment / inoculation . results ( table 1 ) indicated that average efficacy of 5 % mbi sc product sc was much higher than that of 5 % milsana ® sc . in addition , efficacy of 5 % mbi sc product sc was reproducible through batch to batch . 1 ) 5 gram of dry knotweed ( reynoutria sachalinensis ) ethanol extracts are mixed with 2 gram hexanol and 2 gram propylene glycol at 900 rpm for 5 minutes ; 2 ) 22 gram of 2 -[ 2 -[ 3 , 4 - bis ( 2 - methoxyethoxy ) oxolan - 2 - yl ]- 2 -( 2 - methoxyethoxy ) ethoxy ] ethylhexadecanoate and 3 gram sodium lauryl sulfate are added to the mixture and mixed at 900 rpm for 5 minutes ; 3 ) 3 gram of calcium propionate is mixed with 63 gram of water ; 4 ) the mixture from the step 3 is added to the mixture from step 2 by stirring at 900 rpm for 10 minutes to form a clear formulations . this formulation meets the dispersion and stability test , and also passed 2 - week storage stability test at both 4 and 54 ° c . preparation of 20 % reynoutria sachalinensis me ( hereinafter referred to as 20 % mbi me product ): 1 ) 20 gram of dry knotweed ( reynoutria sachalinensis ) ethanol extract is mixed with 7 gram hexanol and 4 grams propylene glycol at 900 rpm for 5 minutes ; 2 ) 30 gram of 2 -[ 2 -[ 3 , 4 - bis ( 2 - methoxyethoxy ) oxolan - 2 - yl ]- 2 -( 2 - methoxyethoxy ) ethoxy ] ethyl hexadecanoate and 6 gram sodium lauryl sulfate is added to the mixture and all of the ingredients are mixed at 900 rpm for 5 minutes ; 3 ) 6 gram of potassium sorbate is mixed with 27 gram of water ; 4 ) the mixture from the step 3 is added into the mixture from the step 2 by stirring at 900 rpm for 10 minutes to form a clear formulation . this formulation meets the dispersion and stability test , and also passed 2 - week storage stability test at both 4 and 54 ° c . the bioassay was performed as described above except that plants were inoculated with a conidial suspension of 2 . 4 × 10 5 conidia per ml . two batches of 5 % mbi me product was diluted at 200 , 800 and 3200 times . one batch of 20 % mbi me product was tested at 2000 fold dilution . results ( table 2 ) indicated that average efficacy of 5 % mbi me product at 800 fold dilution was equal to or better than that of 5 % milsana ® sc at 200 - fold dilution . similarly , average efficacy of 20 % mbi me product at 2000 fold dilution ( table 3 ) was equal to or better than that of 5 % milsana ® sc at 200 - fold dilution . 1 ) 2 gram sodium hydroxide ( or 5 gram sodium carbonate ) is dissolved into 50 grams of water with 4 gram of propylene glycol ; 2 ) 5 gram of liquid formic acids is added to dissolve ; 3 ) 20 gram of dry knotweed ( reynoutria sachalinensis ) ethanol extracts is added slowly with stirring at 900 rpm until a uniform solution is obtained . this formulation meets the dispersion and stability test , and also passed 2 - week storage stability test at both 4 and 54 ° c . the ph value of such a formulation is around 8 - 8 . 5 . bioassay was performed as described above except that plants were inoculated with a conidial suspension of 5 × 10 5 conidia per ml . four batches of 20 % mbi sl product was diluted at 2000 times . results ( table 4 ) indicated that average efficacy of 20 % mbi sl product at 2000 fold dilution was equal to or better than that of 5 % milsana ® sc at 200 - fold dilution . 1 ) 0 . 25 gram dry knotweed ( reynoutria sachalinensis ) ethanol extract is dissolved in 0 . 2 gram hexanol and 100 gram ethanol ; 2 ) 0 . 3 gram of sodium laureth sulfate is added to the mixture , and mixed in ; 3 ) 899 . 25 gram water is added to the mixture ; the mixture is stirred at 900 rpm till a uniform solution is obtained . this formulation passed 2 - week storage stability test at 4 and 54 ° c . it also did not show any phytotoxicity on many flowers 1 ) 0 . 25 gram dry knotweed ( reynoutria sachalinensis ) ethanol extract is dissolved in 0 . 2 gram hexanol and 0 . 2 gram ethanol ; 2 ) 0 . 09 gram of sodium laureth sulfate is added to the mixture , and mixed in ; 3 ) 998 . 96 gram water is added to the mixture and mixed in as well ; and 4 ) 0 . 3 gram of calcium propionate is added and mixed well by stirring at 900 rpm till a uniform solution is obtained . this formulation passed 2 - week storage stability test at 4 and 54 ° c . it also did not show any phytotoxicity on many flowers . bioassay was performed as described above except that plants were inoculated with a conidial suspension of 5 × 10 5 conidia per ml . the same volume of 0 . 025 % mbi rtu product was sprayed for each pot of cucumber plants as 200 - fold dilution of 5 % mbi me product . comparison of bioassay results : results ( table 5 ) indicated that average efficacy of 0 . 025 % mbi rtu product was equal to that of 5 % milsana ® me at 200 - fold dilution . although this invention has been described with reference to specific embodiments , the details thereof are not to be construed as limiting , as it is obvious that one can use various equivalents , changes and modifications and still are within the scope of the present invention . various references are cited throughout this specification , each of which is incorporated herein by reference in its entirety .