Arun Baitha ¹, Ashok Varma ¹

Affiliations
1 Division of Crop Protection Indian Institute of Sugarcane Research Rae Bareli Road, Dilkusha P.O., Lucknow 226002, Uttar Pradesh, IN

Abstract

Growth rate of Trichogramma chilonis Ishii (Sugarcane strain) was carried out on eggs of Corcyra cephalonica. Net reproductive rate (R_o) was found to be 42.99, while the mean duration of a generation was 10.52 days. The intrinsic rate of natural increase (r_m) was found to be 0.3619. The finite rate of increase (1) was 1.436 per female per day.

Keywords

Growth Rate, Life Table, Population, Sugarcane, Trichogramma chilonis.

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R. K. Tanwar ¹, Ashok Varma ¹

Affiliations
1 Division of Entomology, Indian Institute of Sugarcane Research Lucknow 226 002, Uttar Pradesh, IN

Abstract

Field trials were conducted on the releases of Cotesia flavipes Cameron (Indonesian strain) against sugarcane stalk (Chilo auricilius Dudg.) and internode (Chilo sacchariphagus indicus Kapur) borers at IISR Farm, Lucknow for consecutive three crop seasons 1996-97 to 1998-99. The parasitoids were released in one block @ 2000 mated females/ha/month split into four doses from July to October and the other block was treated as check. The results indicated reduction of 56.2, 69.6 and 43.1 per cent in stalk borer infestation in parasitoid released blocks as compared to check, in October during 1996-97, 1997-98 and 1998-99, respectively. The results remained inconclusive in cases of internode borer due to low infestation.

Keywords

Chilo auricilius, Chilo sacchariphagus indicus,Cotesia flavipes, Parasitoid Field Releases.

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R. K. Tanwar ¹, Ashok Varma ¹

Affiliations
1 Division of Entomology, Indian Institute of Sugarcane Research, Lucknow 226002, U. P., IN

Abstract

Laboratory investigations were carried out on rearing, biology, host stage suitability and storage of Indonesian strain of larval parasitoid Cotesiaflavipes (Cameron) using Chilo auricilius Dudgeon as a host. The parasitoid could be successfully reared on larvae of C. auricilius for 11 successive generations without affecting the biotic potential greatly. Adults of C. flavipes lived for 8.7±3.3 (male) and 5.4±2.3 (female) days. The egg + larval, cocoon and total developmental periods of the parasitoid were 15.2±0.3, 8.5±0.3 and 23.7±0.4 days, respectively. Third to fifth instar larvae of C. auricilius were significantly more preferred for oviposition wherein they completed their development successfully. Three day old cocoons could be stored at 10°C for 15 days with 71.6 per cent emergence.

Keywords

Chilo auricilius, Cotesia flavipes, Host Preference, Rearing, Storage.

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Ashok Varma ¹, B. K. Tandan ²

Affiliations
1 Indian Institute of Sugarcane Research, Lucknow 226 002, U. P., IN
2 Department of Zoology, Lucknow University, IN

Abstract

Pathogenicity of three entomogenous fungi, Beauveria bassiana, Fusarium oxysporum and Metarhizium anisopliae var. anisopliae were conducted against eleven different insect pests of sugarcane in the laboratory. Of these, B. bassiana was found most pathogenic to larvae of Chilo auricilius, Chilo infuscatellus and Sesamia inferens; nymphs and adults of Cavelerius sweeti, adults of Phytoscaphus sp. and Astychus lateralis, and grubs of Holotrichia consanguinea. Metarhizium anisopliae was found pathogenic to larvae of C. auricilius, C. infuscatellus and S.  inferens; adults of Phytoscaphus sp. and A. lateralis, and adults and nymphs of Pyrilla perpusilla. Fusarium oxysporum was found effective against larvae of C. auricilius, C. infuscatellus and S. inferens; and adults and nymphs of P. perpusilla.

Keywords

Beauveria bassiana, Fusarium oxysporum, Metarhizium anisopliae, Pathogenicity, Sugarcane Insect Pests.

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Ashok Varma ¹, B. K. Tandan ¹, Kishan Singh ¹

Affiliations
1 Indian Institute of Sugarcane Research, Lucknow, IN

Abstract

Of all the pests infesting sugarcane in India, the maximum economic loss is undoubtedly inflicted by Pyrilla perpusilla (Walker). Hence, build up of this fulgorid in sugarcane agroecosystem is regularly monitored by the Indian Institute of Sugar cane Research, Lucknow.

Keywords

Pyrilla perpusilla, Sugarcane, Entomophthora sp., Hirsutella citriformis.

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R. K. Tanwar ¹, Ashok Varma ¹

Affiliations
1 Indian Institute of Sugarcane Research, P.O. Dilkusha, Lucknow 226 002, IN

Abstract

Field evaluation of the exotic larval parasitoid, Allorhogas pyralophagus Marsh was carried out under field conditions at the Indian Institute of Sugarcane Research (IISR) farm (Lucknow), Simbhaoli (Gbaziabad) and Majethia Farm (Sardarnagar) against the larvae of the top borer, Scirpophaga excerptalis Walker. The recovery of the released parasite was poor and only a few cocoon masses of released parasite were recovered at IISR farm and Simbbaoli. The parasite, in spite of repeated releases for many years could not be established in the released areas. Parasitation and emergence behaviour of the wasp was also studied under laboratory conditions using field-coHected top borer - Infested canes. The wasp parasftised the top borer larva In the cane through the silken covering present over the slit formed during feeding of host larva. The wasp, after completing its development on host larva, emerged through tbe same silt.

Keywords

Allorhogas pyralophagus, Field Evaluation, Scirpophaga excerptalis.

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R. B. Jadhav ¹, Ashok Varma ¹

Affiliations
1 Biological Control Centre, Pravara Nagar Division of Entomology, Indian Institute of Sugarcane Research, Lucknow, IN

Abstract

Attempts to colonise Epiricania melanoleuca (Fletcher,an ectoparasitoid of Pyrilla perpusilla (Walker) are being made around Kopergaon, Shrirampur Taluka, Sangamner and Rahuri areas since the inception of the biological control sub centre of the Indian Institute of Sugarcane Research, Lucknow at Pravara Nagar in 1978.

Keywords

Epiricania melanoleuca, Hyperparasitoid, and Predators.

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