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SRINIVASAN, R.
- Evaluation of Quality of Trichogramma chilonis Ishii from Different Production Units in India
Abstract Views :198 |
PDF Views:180
Authors
Affiliations
1 P. B. No. 2491, H. A. Farm Post, Bellary Road, Bangalore, 560 024, Karnataka, IN
1 P. B. No. 2491, H. A. Farm Post, Bellary Road, Bangalore, 560 024, Karnataka, IN
Source
Journal of Biological Control, Vol 19, No 1 (2005), Pagination: 1-8Abstract
The post-shipment quality of parasitized egg cards of Trichogramma chilonis Ishii obtained from nine production units in South India was evaluated. Evaluations included the number of parasitized eggs per card, per cent parasitism, per cent adult emergence, sex-ratio and parasitizing efficiency on the target host. There was a lot of variation in the card size and the number of eggs per card. The parasitism was more than 90 per cent in the tricho-cards supplied by two units. The adult emergence and sex-ratio was as per the quality standards, Considering the recommendation of 1,50,000 parasitized eggs per hectare of cotton, only three units could reach the quality standards. The parasitizing efficiency of T. chilonis supplied by two units was less than 50 per cent and parasitism ranged between 60 and 73 per cent in the others. There is a need for regulatory agencies to periodically evaluate the quality of Trichogrammatids produced by insectaries based on simple and reliable methods. Trichogramma producers should reach a consensus with respect to the method of producing Tricho-cards and recommendations to be given to farmers. This would ensure the proper utility of Trichogrammatids in biocontrol programmes.Keywords
Helicoverpa armigera, Quality Evaluation, Trichogramma chilonis.- A Note on the Biology of Anastatus tenuipes an Oothecal Parasitoid of Brown Banded Cockroach Supella longipalpa
Abstract Views :210 |
PDF Views:83
Authors
Affiliations
1 Vector Control Research Centre, Pondicherry - 605 006, IN
1 Vector Control Research Centre, Pondicherry - 605 006, IN
Source
Journal of Biological Control, Vol 6, No 1 (1992), Pagination: 44-45Abstract
Anastatus tenuipes Bolivar (Hymenoptera:Eupelmidae), a dimorphic parasitic wasp was found to parasitize the oothecae of the brown banded cockroach, Supella longipalpa Fabricius, (Dictyoptera:Blattellidae) in nature. Ananthasubramanian and Ananthakrishnan (1961) described the biology of an undetermined species of Anastatus from S. supellectilium Serville (=longipalpa). Later extensive studies were carried out on some of the species such as A.umae Boucek (Uma Narasimham and Sankaran, 1982), and A. floridanus Roth & Willis (Flock, 1941). However, very little is known about the biology of A. tenuipes in the brown banded cockroach which is a mechanical vector of many pathogenic organisms affecting man (Roth and Willis, 1957).Keywords
Anastatus tenuipes, Supella longipalpa, Oothecal Parasitoid.- In vitro Screening of the New Strobilurin Fungicide Pyraclostrobin 20% WDG and Biocontrol Agents against Aspergillus niger (Van Tieghem) Causing Collar Rot in Groundnut
Abstract Views :304 |
PDF Views:131
Authors
Affiliations
1 Gandhigram Rural Institute–Deemed University, Gandhigram, Dindigul, Tamil Nadu, 624 302, IN
1 Gandhigram Rural Institute–Deemed University, Gandhigram, Dindigul, Tamil Nadu, 624 302, IN
Source
Journal of Biological Control, Vol 29, No 4 (2015), Pagination: 219-222Abstract
The in vitro experiment revealed that the fungicide pyraclostrobin 20% WDG at 0.1%, 0.15% concentrations and carboxin + thiram 75% WS (Vitavax) at 0.2% conc. completely inhibited the mycelial growth of Aspergillus niger and accounted for 100% inhibition of the pathogen followed by carbendazim @ 0.1% ( 98.42% ), mancozeb @ 0.2% (94.51% ) and pyraclostrobin 20% WDG at 0.5% (98.46% ). Pseudomonas fluorescens recorded the higher inhibition of the pathogen as compared to Trichoderma harzianum. The present study clearly revealed that the fungicide pyraclostrobin 20% WDG at 0.1% and 0.15% completely inhibited the pathogen A. niger.Keywords
Pyraclostrobin, Aspergillus niger, Groundnut, Collar Rot, Screening.References
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- Effect of selected neonicotinoids on predatory coccinellids in Bt cotton ecosystem .
Abstract Views :156 |
PDF Views:80
Authors
R. SRINIVASAN
1,
M. R. RAJAN
2
Affiliations
1 Department of Biology, Gandhigram Rural Institute, Gandhigram – 624302, Tamil Nadu, India ., IN
2 Department of Biology, Gandhigram Rural Institute, Gandhigram – 624302, Tamil Nadu, India ., IN
1 Department of Biology, Gandhigram Rural Institute, Gandhigram – 624302, Tamil Nadu, India ., IN
2 Department of Biology, Gandhigram Rural Institute, Gandhigram – 624302, Tamil Nadu, India ., IN
Source
Journal of Biological Control, Vol 35, No 4 (2021), Pagination: 247 - 254Abstract
Field studies were conducted in two villages viz., Mambattu and Salai in Tamil Nadu to assess the toxicity of five neonicotinoids viz., imidacloprid 17.8 SL, acetamiprid 20 SP, thiacloprid 21.7 SC, thiamethoxam 25 WDG and clothianidin 50 WDG to coccinellid predators in Bt cotton. At 1, 3, 7 and 14 days after treatment, standard check monocrotophos recorded maximum reduction of 78.8, 83.5, 70.4 and 62.6% respectively. Among neonicotinoids, clothianidin was found to be comparatively more toxic to coccinellids, followed by thiamethoxam and thiacloprid. Acetamiprid was found to be safest among chemical treatments with population reduction of 45.6, 53.9, 36.5 and 24.7% respectively at 1, 3, 7 and 14 days after treatment followed by imidacloprid and thiacloprid. Two rounds of spray of neonicotinoids on Bt cotton had significant impact on the coccinellids, when compared with untreated control plots. However, monocrotophos recorded relatively lowest population of coccinellids compared to untreated control and neonicotinoids. With significant population built-up after 7 days after acetamiprid and imidacloprid sprays, the 2 neonicotinoids may be suitable candidates for inclusion in integrated pest management of sucking insect pests in major Bt cotton growing areas as these insecticides are comparatively less toxic to predators as compared to other neonicotinoids like thiacloprid, thiamethoxam and clothianidin and non-selective insecticide like monocrotophos.Keywords
Bt cotton, coccinellids, natural enemies, neonicotinoids .References
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