K. S. Brar ¹, B. S. Sekhon ¹, J. Singh ¹, M. Shenhmar ¹, Joginder Singh ¹

Affiliations
1 Department of Entomology, Punjab Agricultural University, Ludhiana 141 004, Punjab, IN

Abstract

Two biocontrol based IPM modules, along with Punjab Agricultural University (PAU) spray schedules were evaluated for the management of cotton bollworms. IPM module II (3 sprays each for sucking pests and cotton bollworm + 8 releases of Trichogramma chilonis @ 1,50,000/ha/week + one release of Chrysoperla carnea @ 10,000/ha) was on par with PAU spray schedule in reducing the bollworm damage and increasing the yield. When T. chilonis (Bathinda strain) was integrated with insecticides it reduced the damage of bollworm by 70.3 percent and gave higher yield by 44.5 percent over insecticides alone.

Keywords

Chrysoperla carnea, Cotton Bollworms, Insecticides, IPM Module, Trichogramma chilonis.

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K. S. Brar ¹, S. S. Khosa ², B. S. Sekhon ³

Affiliations
1 Department of Entomology Punjab Agricultural University Ludhiana, 141 004, Punjab, IN
2 Nahar Sugar and Allied Industries, Ltd., Amloh, Fatehgarh Saheb, Punjab, IN
3 Regional Research Station, Bathinda, Punjab, IN

Abstract

In cotton field Trichogramma chilonis could disperse as far as 9 metres to search its host, but the maximum parasitization was observed up to 2 metres. The performance of the Muktsar population was better than all other populations. The laboratory reared population was significantly inferior to all field collected populations.

Keywords

Cotton, Host Searching Capacity, Populations,Trichogramma chilonis.

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S. Kaur ¹, K. S. Brar ¹, B. S. Sekhon ¹, N. Joshi ¹, M. Shenhmar ¹, J. Singh ¹

Affiliations
1 Department of Entomology, College of Agriculture Punjab Agricultural University, Ludhiana 141004, Punjab, IN

Abstract

Studies were conducted to assess tbe role of natural mortality factors in Helicoverpa annigera (Hubner) on chickpea in Punjab. The larval parasitoid Campoletis chlorideae Uchida bas been recorded as the most important mortality factor. Parasitism due to C. chlorideae ranged from 0.98 to 68.50 per cent throughout the crop season. The maximum parasitism was recorded during 3rd week of February, 1999 when the minimum mean temperatures and relative humidity were 11.9°C and 95 per cent, respectively. As C.chlorideae helps in suppressing tbe pest population both at vegetative and flowering! pod formation stage or the crop, it suggests that the conservation of C. chlorideae in chickpea is important.

Keywords

Campoletis chlorideae, Chickpea, Helicoverpa armigera, Parasitoid.

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J. S. Gill ¹, G. C. Varma ¹, B. S. Sekhon ², M. Shenhmar ¹

Affiliations
1 Punjab Agricultural University, Ludhiana - 141004, IN
2 Regional Research Station, Bathinda, IN

Abstract

The comparative efficacy of Trichogramma chilonls Ishii (8 releases @ 1,50,000 parasitized eggs/ha), T. chilonis 8 releases +5 Insecticidal sprays (3 of oxydemeton methyl 0.075% and one each of cypermethrln 0.016% and carbaryl 0.4%) and insecticide treatments having seven sprays (3 of oxydemeton methyl, 2 of cypermethrin and one each of carbaryl and fenitrothion 0.34%) against cotton bollworms was studied. The number of bolls per plant In T. chilonis, T. chilonis + insecticides and insecticide treatments was 38.8, 46.3 and 47.2 respectively and they were significantly higher than in control (19.4). The damage to loculi was significantly higher in control (47.5 per cent) while In T. chilonis, T. chilonis + insecticide and insecticide treatments it was 30.2%, 13.1% and 10.1% respectively and the latter two treatments were on par with each other. The highest yield was obtained with insecticide treatment (19.7 Q/ha) followed by T. chilonis + insecticide treatment (18.6 Q/ha) and T. chilonis treatment (12.1 Q/ha). The yield in control was 8.6 Q/ha.

Keywords

Cotton Bollworms, Trichogramma chilonis, Insecticides, Integrated Control.

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