Mulberry powdery mildew disease caused by Phyllactinia corylea (Pers.) Karst is a production constraint during winter months. A mycophagous coccinellid, Illeis bielawskii Ghorpade was found to be associated with the disease. Population of I. bielawskii among mulberry varieties ranged from 2.47numbers/plant (MR2) to 15.92/plant (Kanva 2). The egg, larval and pupal periods were 2.97, 9.00 and 3.22 days, respectively. The adult longevity was 20-25 days. The grubs and beetles actively fed on the fungus and the rate of feeding was found to be highest in adult (118.91 cm2), followed by fourth instar grub (43.28 cm2), Safety studies conducted revealed that there was no significant difference in hatching of eggs between control (no insecticide treatment) and the insecticide treatments, viz., malathion, methyl demeton and dichlorvos, However, a mortality of 50 and 46.67 per cent was observed when grubs were fed with mildew affected leaves treated with malathion and dichlorvos. To be effective as a biocontrol agent, it should not behave as a vector, Studies conducted on disease-vector relationship revealed that I.bielawskii does not have any significant role in disseminating the powdery mildew pathogen, P. corylea.
Keywords
Feeding Rate, Grub Mortality, Hatchability, Illeis bielawskii, Phyllactinia corylea, Mulberry, Vector.
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