Maninder Shenhmar ¹, G. C. Varma ¹

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

Abstract

The rice crop is affected by seven tissue borers in India and most important and widely distributed one is the yellow stem borer Scirpophaga incertulas Walker (Banerjee, 1964; Atwal, 1986). The control of this borer by chemicals is difficult as the larva enters into the plant tissue soon after hatching and the entire larval and pupal period is spent within the stem. Some encouraging results to control this borer with chemicals have been achieved (Banerjee, 1964). But keeping in view the harmful effect of indiscriminate use of insecticides and specially their role in eliminating the beneficial fauna, the emphasis is shifting towards development and implementation of integrated pest management (IPM) approaches in controlling the insect pests. So the efficacy of Trichogramma japonicum Ashmead was studied under field conditions to control this pest.

Keywords

Trichogramma japonicum, Scirpophaga incertulas, Field Evaluation.

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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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K. S. Brar ¹, G. C. Varma ¹

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

Abstract

Trichogrammatoidea eldanae Viggiani is an important parasitoid of the sugarcane borer, Eldana saccharina Walker in South Africa (Conlong and Hastings, 1984). It has recently been introudced into India (Anon., 1987) and is being mass multiplied and tested against Chilo auricilius Dudgeon. in the Punjab. The growth rate and population of this parasitoid has not been studied so far. The present studies were, therefore, undertaken to study the growth rate of the parasitoid.

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