Authors
Abstract
Mulberry powdery mildew is the most important fungal disease in silkworm rearing zones. Resistance of mulberry varieties is different against this disease. The mulberry varieties have different resistance against powdery mildew disease. Percentage of moisture, nitrogen, protein, phosphor, fiber, calcium and ash of powdery mildew infected leaves and healthy control in five mulberry varieties including Kenmochi, Local, Kaironozomi, Ichinose and Shinichinose were determined. Meanwhile, larvae mortality percentage, pupae mortality percentage, total produced cocoon weight, cocoon weight, single cocoon shell weight and percentage, and produced cocoon number recorded after larvae feeding with control and infected leaves. The obtained results showed that powdery mildew disease resulted to nutrients decline in mulberry leaves and economical parameters in those larvae which fed with infected leaves (P< 0.01). Moisture percentage, protein, percentage, nitrogen, phosphor, calcium decreased after powdery mildew infectious for each five races. Meanwhile, pupae mortality percentage, single cocoon weight, single cocoon shell weight and percentage, and produced cocoon number decreased after feeding with infected leaves for total five varieties significantly (P< 0.05). Therefore, quality decline of mulberry leaf under powdery mildew disease resulted to decreasing of silkworm performance in rearing process.
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