Study on feeding of powdery mildew infected mulberry leaves in silkworm rearing and its bioassay
Journal Title: Bioscience Discovery - Year 2017, Vol 8, Issue 1
Abstract
Incidence of diseases in mulberry is one of the major problems for successful sericulture in India, of which powdery mildew [Phyllactinia corylea (Pears) Karst] is very common and causes significant losses to the farmers. To assess the damage caused by powdery mildew during rearing, silkworms were fed with mulberry leaves (variety S1) carrying different levels of infection. Larval duration was increased by two days when disease infected leaves were used for feeding. Maximum larval weight was recorded in control (3.03 g) and larval weight decreased with the level of infection while none of the silkworms survived till 5th instar when leaves with highest level of infection were used for feeding. Average larval length was longest (7.33 cm) in the control. Control also recorded highest single cocoon weight (1.98 g), single shell weight (0.42 g), shell ratio percentage (21.15%), effective rate of rearing- wt (16.09 kg) and effective rate of rearing-no (9266.66). Correlation analysis revealed that Single cocoon weight and single shell weight was positively correlated with larval weight with correlation coefficient of 0.936 and 0.927 respectively. The experiment confirmed that reduction in quality and yield during rearing was proportional to the level of disease incidence in the leaves used for feeding.
Authors and Affiliations
S. Jamuna Mary1 and S. Indira2
Keywords
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