Abstract
During the spring season of 2019, the effect of two insecticides (Cymbush®&Tracer®) on larvae of Bombyx mori L. were studied at Plant Protec. Dept. Fac. of Agric., Fayoum Univ. Insecticides were sprayed on mulberry trees by concentration 1ml/l . of Cymbush® and 0.1ml/l. of Tracer® .Mulberry leaves were harvested on to three times (after 3,6,9,12 days).Results show that, the 5th instar larval mortality percentages increased , where data ranged between 18.30% in Cymbush® and 10.21% in Tracer® compared to 9.93% in control. While cocooning percentages, cocoon shell ratio and silk productivity were decreased when comparing to control, where data ranged between 74.00% in Cymbush®, 89.08% in Tracer® , 12.00% in Cymbush®,19.07% in Tracer® and 1.021cg/day in Cymbush®, 1.800cg/day in Tracer® , respectively compared to 93.00%, 19.77% and 1.910cg/day in control, respectively.
Highlights
The silkworm Bombyx mori L. is herbivorous and feeds exclusively on fresh mulberry leaves during the larval phase (Nagaraju and Goldsmith, 2002).The silk industry plays an important role in the economy, so research on silkworm and mulberry crop enhancement is of high importance
Data in table (1) show that 5th instar mortality percentages of B. mori fed on mulberry leaves sprayed with insecticides were 16.54 and 18.30% in Cymbush®&Tracer®, respectively in the first group compared to 10.54% in control
2012 found highly toxic in stomach of B. mori larvae when feeding on toxic mulberry leaves treated with butenefipronil
Summary
The silkworm Bombyx mori L. is herbivorous and feeds exclusively on fresh mulberry leaves during the larval phase (Nagaraju and Goldsmith, 2002).The silk industry plays an important role in the economy, so research on silkworm and mulberry crop enhancement is of high importance. During the spring season of 2019, the effect of two insecticides (Cymbush®&Tracer®) on larvae of Bombyx mori L. were studied at Plant The effect of two insecticides on the productivity of silkworm, Bombyx mori L. were studied during spring season of 2019 at Plant Protec.
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