Chemical control of Diacrisia obliqua Walker on sunflower
2007
Ajmal, M. (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Research Programme) | Ehsan-ul-Haq (National Agricultural Research Centre, Islamabad (Pakistan). Insect Pest Management Programme)
Neonate larvae of D. obliqua were collected and reared on sunflower in the laboratory at 30 degree C plus minus 2 and 50% R.H. Larvae were weighed and put in a plastic containers covered with muslin cloth. For treatment application, the fresh sunflower leaves were sprayed with polyrin-C 0.01%. The results revealed that higher body weight larvae result in significantly low mortality percentage which may be due to thickness and density of body hairs on particular species or some enzymatic change in larvae over age which can tolerate the efficacy of particular insecticide. For practical purposes, it is recommended that chemical control measures should be taken in early days of hairy caterpillar infestation on sunflower, especially when larval weight is low.
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