K. S. Sangha , A. S. Sohi

Abstract

The studies on bioecology of Poplar leaf Defoliator, Clostera fulgurita (Walker) (Lepidoptera: Notodontidae) on Poplar were carried out at Entomological Research Farm, Punjab Agricultural University, Ludhiana. Biological studies revealed that the clones PL1, PL5 and PL7 had no effect on the duration of eggs, larvae, pupae and adults longevity. The egg, larval, pupal stage and adult longevity ranged from 3 to 6.42, 14.61 to 43.30, 6.50 to 55.50 and 4.93 to 7.35 days respectively. The defoliator had ten generations/year and the time taken to complete a generation varied from 27 to 94 days. Measurements of eggs, larvae, pupae and adults varied from 0.52 to 0.59 mm, 3.37 to 41.31 mm, 15.85 to 17.88 mm, and 2.87 to 3.87 cm (wing expanse) and 1.53 to 1.55 cm (body length) respectively. Pupation occurred in thin hairy cocoon between two leaves held together by silken thread. Fecundity varied from 268 - 669 among the clones. Maximum adult emergence and mating took place during 5.00 - 9.00 hours.

Keywords

Biology, Clostera fulgurita, Poplar Clones, Punjab

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Ravinder Singh , A. S. Sohi , K. S. Sangha

Abstract

Biology of Asphadastis cryphomycha Meyrick was studied on Populus deltoides under screen house conditions. Duration of the egg stage ranged from 4.40 to 6.90 days during different months. Total larval period, prepupal and pupal period varied from 12.60 ± 0.15 to 19.10 ± 0.17, 2.20 ± 0.15 to 89.60 ± 0.65 (December to March), and 4.60 ± 0.15 to 8.20 ± 0.81 days. The adults emerged during 23.00 to 4.00 hours (24 hour time). Longevity of females was more than males. The average fecundity ranged from 22.60 ± 2.18 to 49.60 ± 7.36 eggs during different months. The pre-oviposition, oviposition and post-oviposition periods were recorded. The webber passed through eight generations per year. Leaf area fed by the larval instars has been worked out. Detailed measurements of the various stages were recorded.

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K. S. Sangha , G. S. Makkar

Abstract

Efficacy of different insecticides against bark eating caterpillar, I. quadrinotata was tested in the field on four years old Poplar plantation using a motorized sprayer. Five insecticides, viz., Sevin 50WP (carbaryl), Dursban 20EC (chlorpyriphos), Thiodan 35EC (endosulphan), Ekalux 25EC (quinalphos) and Curacron 50 EC (profenophos) at 0.05 per cent concentration, were tested in randomized block design with four replications. All the insecticides were significantly better than the untreated control. However, Sevin 50WP resulted in the maximum reduction in insect population (96.8 PROC) whereas Curacron 50EC, the minimum (88.9 PROC) after 15 days of treatment among the five insecticides tested. The use of motorized sprayer proved more effective as this increased the height of spray and coverage area.

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Ravinder Singh , A. S. Sori , K. S. Sangha , P. S. Shera

Abstract

The study on the scasonal history, host range and nature of damage was carried at the villages, Khera bet, Lalton and Tajpur in the Ludhiana district. Two peaks of the insect population were observed during April-June and September-November. The larval and pupal population per web varied from 0.00-6.85 and 0.00-0.55 respectively. The first and second instars of the leafwebber were found feeding on leaves along the midrib and vein whereas the third, fourth and fifth ins tars remained feeding inside the web, made by webbing 2-3 leaves together with silken threads. In the field twigs with webs varied from 10.00-67.50 per cent and webbed leaves/twigs varied from 20-60 percent.

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K. S. Sangha , P. S. Shera , G. P. S. Dhillon

Abstract

No abstract

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Ravinder Singh , A. S. Sohi , K. S. Sangha

Abstract

No abstract

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