Effect of bottlegourd seedcoating with antagonists on seedlings, quantum of the pathogen inside the seedlings and population of the soil againstFusarium oxysporum
Bottlegourd seedlings raised from antagonists coated seeds did not show any wilting symptoms and remained completely healthy. The pathogen quantum inside the host tissue was found least. The pathogen propagules per gram of host tissue were restricted and the soil population of theFusarium oxysporum was reduced very much in antagonists introduced soil.
SOME RELATIONSHIP BETWEEN PLANT NUTRITION, FUNGAL POPULATIONS, AND INCIDENCE OF FUSARIUM WILT OF MUSKMELON.
The rate of muskmelon wilt was shown to be a function of the amount of nitrogen available to and absorbed by the plant. Since NH4NO3 nitrogen did not increase the size of the soil population of eit...
CULTURAL AND PATHOGENIC VARIATION IN THE MUSKMELON WILT FUNGUS, FUSARIUM OXYSPORUM f. MELONIS
The morphology of F. oxysporum f. melonis was markedly influenced especially during early growth by light, temperature, acidity, and composition of certain laboratory media. At 2 to 3 days, on an acidified peptone medium, the fungus produced macroconidia abundantly and closely similar to those found on the surface of a lesion of a wilted plant.Pigmentation, type and amount of mycelium, and sporulation of colonies varied appreciably. Interaction, indicated by "barrage lines", occurred between colonies of identical origin. Under certain cultural conditions 'wild type' isolates were morphologically indistinguishable from cultural mutants. Some mutation occurred in sterile soil culture. The morphological adaptability of the wilt fungus to cultural conditions was sufficiently great to cast doubt on the validity of delineating biologic forms and races by certain arbitrary, cultural criteria.Isolates from freshly wilted plants from different fields and from several varieties differing in susceptibility were mark...