B. K. Mishra ¹, B. Senapati ¹

Affiliations
1 Department of Entomology, College of Agriculture, Orissa University of Agriculture and Technology, Bhubaneswar 751 003, IN

Abstract

The egg-larval and pupal periods of Apanteles cypris Nixon (Hymenoptera: Braconidae), a larval parasitoid of Cnaphalocrocis medina lis (Guenee) were 0.90±0.72 and 3.70±0.73 days, respectively. Longevity of male and female were 4.1±0.71 and 3.95±0.82 days, respectively. Male:female ratio was 1: 1.8. Life table data of the parasitoid indicated that the ovipositing females lived for maximum six days and they increased their population at the rate of 30.97 per generation (R_o) with mean generation time(T_c) of 14.01 days. The intrinsic rate of natural increase (r_m) was 0.249 and the finite rate of increase (λ) was 1.282 females/female/day.

Keywords

Apanteles cypris, Biology, Life Table, Intrinsic Rate of Increase, Cnaphalocrocis medinalis.

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B. K. Mishra ¹, B. Senapati ¹

Affiliations
1 Department of Entomology, Orissa University of Agriculture and Technology, Bhubaneswar 751 003, IN

Abstract

Biology of Goniozus triangulifer Kieffer (Hymenoptera : Bethylidae) on Cnaphalocrocis medinalis (Guenee) revealed the egg-larval period to be 9.05±1.14 days, pupal period 3.65±0.48 days and adult longevity 8.30±1.26 days for males and 11.10±1.77 days for females. Sex ratio was 1:4.30 (M:F). Life table data of the parasitoid indicated that the ovipositing females lived for a maximum of 9 days and increased its population at the rate of 16.40 per generation (R₀) with mean generation time (T_c) of 14.61 days. The intrinsic rate of natural increase (r_m) was 0.193 and the finite rate of increase (λ) was 1.212 females/female/day.

Keywords

Age Specific Fecundity, Biology, Cnaphalocrocis medinalis, Goniozus triangulifer, Intrinsic Rate of Increase.

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B. K. Mishra ¹, S. M. A. Mandal ¹

Affiliations
1 National Agricultural Research Project (OUAT), Umerkote, Dist. Nowrangpur, Orissa, 764073, IN

Abstract

The comparative efficacy of Trichogramma aehaeae Nagaraja and Nagarkatti, Trichogramma brasiliensis Ashmead and Trichogramma chilonis Ishii (8 releases @ 1,50,000 parasitised eggs/ha) was studied. Of the three species, T.achaeae was the most effective with 18.7% boll infestation, 51.8 bolls/plant and 14.3 q/ha seed cotton yield, followed by T.chilonis with 23.5% boll infestation,48.4 bolls/plant and 12.8 q/ha yield and T.brasiliensis with 27.7% boll infestation,43.2 bolls/plant and 11.4 q/ha seed cotton yield, Control had 32.3 % boll infestation, 30.6 bolls/plant and 7.6 q/ha seed cotton yield which were significantly lower than in different treatments.

Keywords

Cotton Bollworms, Trichogramma achaeae, T. brasiliensis, T. Chilonis, Comparative efficacy

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N. C. Patnaik ¹, J. N. Mohanty ², B. K. Mishra ², M. K. Ghode ³

Affiliations
1 OUAT Research Station. Post Box-10, Sunabeda-2. Koraput (Orissa), IN
2 Department of Entomology, Orissa University of Agriculture and Technology Bhubaneswar 751003, IN
3 Central Biological Control Station, Lewis Road, Bhubaneswar (Orissa), IN

Abstract

The seasonal activity and suppressive action of Epiricania melanoleuca (Fletcher), a nymphal-adult parasite of Pyrilla perpusilla (Wlk.) was studied in an endemic cane growing village of Puri district (Orissa) where the parasite had been introduced against the pest. Peak pyrilla activity was observed in the second fortnight of September whereas, the parasite activity reached its peak activity with a time lag of one month. The parasite:pest ratio which was 1:64 in the second fortnight of August, declined to 1:0.25 in the second fortnight of October, implicating the suppresive role of the parasite over the pest.

Keywords

Pyrilla perpusilla, Nymphal - Adult Parasite, Epiricania melanoleuca.

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