Monitoring the appearance and possibility for prevention of the apple sawfly in Croatia
The apple sawfly Hoplocampa testudinea Klug has recently become a widespread pest in Croatian apple orchards. It causes severe damage in the blooming period due to the fact that infested fruit fall off.This article shows results collected over three years of field research on trap catches of sawflies, the period of laying eggs, the appearance of larvae and detection of damage. In the climate of northwestern Croatia, adult sawfly appear in April during the blooming period of the early apple variety of Idared.By monitoring temperatures from January 1, adults were detected when the thermal constant reached 210 day-degrees. Our observations showed that the larvae emerged when the sum of thermal constants reached ca. 110 day-degrees.The investigation of effective control strategies with insecticides showed high efficacy of thiametoxam (Actara), imidacloprid (Confidor), thiacloprid (Calypso) and betacyfluthrin + oxydemeton-methyl (Enduro) and lower efficacy of phosalone (Zolone), chlorpyrifos-methyl (Reldan), and lambda cyhalothrin (Karate).
Persistence of thiacloprid residues on brinjal (Solanum melongena L.)
Thiacloprid, a neonicotinoid insecticide with novel mode of action, is found to be effective against several lepidopteran as well as hemipteran pests. The present studies were carried out to observe the persistence pattern of thiacloprid on brinjal and to suggest suitable waiting period for the safety of consumers. Persistence of thiacloprid in brinjal was studied following three applications of thiacloprid (Alanto 240 SC) at 180 and 360 g a.i. ha−1 at 7 days interval. Residues of thiacloprid in brinjal were estimated by high-performance liquid chromatography and were confirmed by liquid chromatography–mass spectrometry. The average initial deposits of thiacloprid were observed to be 0.48 and 1.05 mg kg−1 on the brinjal fruit following third application of thiacloprid at recommended and double the recommended dosages, respectively. Half-life periods for thiacloprid were found to be 0.47 and 0.50 days at single and double the application rates, respectively. Residues of thiacloprid declined below its limit of quantification of 0.05 mg kg−1 after 3 and 5 days, respectively, at recommended and double the recommended application rates. Therefore, the use of thiacloprid does not seem to pose any risk hazard and a waiting period of 1 day is suggested for safe consumption of brinjal fruits.
Household economy and gendered labor in the 17th centurya.d. on Guam
Abstract The gendered division of labor in household economies is well known in documentary accounts of many societies, although archaeological evidence for it is often elusive. Our study compares ethnohistorical accounts of household organization with archaeological patterns at a 17th-century village on the island of Guam in the Marianas archipelago to determine if these different sources of evidence provide similar insights. We investigated archaeological assemblages from two latte (megalithic) buildings to document their economic activities. Unexpected differences in their assemblages revealed that economic activities varied between the two latte buildings. They were domiciles of a single economically integrated household, but their disparate functions likely signaled a gendered division of labor. This study reveals aspects of gendered labor that documentary accounts do not fully describe. Our findings suggest that the assumption that domestic buildings were functionally redundant in traditional societies must be tested on a case-by-case basis.