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- Title
Effect of Toxicity of Various Insecticides on the Rearing Performance of Bombyx mori L.
- Authors
KUMAR, T. SUNIL; NAIKA, RAMAKRISHNA
- Abstract
The bioassay study was conducted to test the efficacy of different insecticides on mulberry leaf roller Diaphania pulverulentalis (Hampson). The effective insecticides with selected dose were sprayed on mulberry plants and fed to silkworm Bombyx mori L. at 10, 15, 20, 25 and 30 days after spraying (DAS) to find the impact of such chemicals on silkworms. The results revealed that among the eight insecticides tested, lambda - cyhalothrin and emamectin benzoate were highly toxic to silkworms with 100 per cent mortality even after 30 DAS. However, the insecticide Chlorofenapyr (1.5 ml/liter) recorded less mortality (12.09%) of silkworms at 10 days after spray which is on par with that of untreated control (8.99%) and standard check Dichlorvos (11.27%). Similarly, the larval mortality recorded in batches of silkworms fed on mulberry leaves sprayed with Azadirachtin and Novaluron (10.00% & 9.67%, respectively) at 25 DAS was on par with that of standard check and untreated control. Whereas, the insecticides Profenofos and fipronil at 30 DAS recorded less mortality rate of 11.00 per cent and 10.67 per cent, respectively. Similar trends were observed with respect to rearing performance of silkworms. The findings of present study clearly indicated that the insecticide Chlorofenapyr was proved to be less toxic to silkworms even at 10 DAS followed by Azadirachtin and Novaluron at 25 days after spraying and Profenofos and fipronil at 30 days after spraying. However, lambda - cyhalothrin and emamectin benzoate were highly toxic to silkworms even after 30 DAS. Chlorofenapyr, Azadirachtin and Novaluron could be the alternate insecticides to be thought to manage the mulberry leaf roller in view of the ban on Dichlorvos the safest insecticide recommended in mulberry.
- Subjects
TOXICOLOGY of insecticides; SILKWORMS; INSECT mortality; MULBERRY; AZADIRACHTIN
- Publication
Mysore Journal of Agricultural Sciences, 2019, Vol 53, Issue 3, p36
- ISSN
0047-8539
- Publication type
Article