EFFICACY OF NOVEL INSECTICIDES ON PINK MEALYBUG Maconellicoccus hirsutus GREEN ON MULBERRY AND THEIR SAFETY TO SILKWORM, Bombyx mori L.
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Date
2017-07-24
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
During the present investigation, attempt was made to find out effective chemicals
for the management of pink mealybug on mulberry. Initially, chemicals with novel modes
of action were assessed in the laboratory. Based on the laboratory results, promising
insecticides were assessed in the field at different doses against mealybug. Data was also
generated on safety of the treated mulberry leaves for silkworm rearing, phytotoxicity on
mulberry and safety to natural enemies. The field experiment results revealed that among
the insecticides, dinotefuron 20 SG @ 0.25 g/l exhibited higher mealybug mortality at
both 7 and 15 days after spraying (DAS), followed by pymetrozine 50 WG @ 0.6 g/l and
azadirachtin 1 % @ 2 ml/l. Further, these chemicals were found non phytotoxic to
mulberry and safer to coccinellid beetles, a prominent natural enemy of mealybug.
Maximum mulberry leaf yield was recorded in dinotefuron 20 SG @ 0.25 g/l.
Dinotefuron 20 SG, pymetrozine 50 WG and azadirachtin 1 % at different doses were
found safer to silkworms even at 10 DAS and exhibited better rearing and reeling
parameters. On the contrary, flonicamid 50 WG 0.3 g/l exhibited phytotoxicity and
affected silkworm rearing.
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