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Chitra, N.
- Prey Preference of Orthopteran Predators on Rice Insect Pests
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Authors
Affiliations
1 Agricultural Research Station, Ramanathapuram 623 501, Tamil Nadu, IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
1 Agricultural Research Station, Ramanathapuram 623 501, Tamil Nadu, IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 16, No 2 (2002), Pagination: 109-112Abstract
The predatory potential of the orthopteran predators viz., Conocephalus longipennis (de Haan), C, maculatus Le Guiilou, Anaxipha longipennis Serv. and Metioche vittaticollis (Stal) against the eggs of rice insect pests was studied under laboratory conditions. M. vittaticollis proved to be an effective predator on the eggs of rice leaf folders (Cnaphalocrocis medinalis (Guenee) and Marasmia patnalis (Bradley) and rice moth, Corcyra cephalonica (Stainton), while C. longipennis and C. maculatus fed voraciously on the eggs of rice stem borer (Scirpophaga incertulas Walker) and rice earhead bug, Leptocorisa acuta (Thunberg), M. vittaticollis did not feed on stem borer eggs while C. longipennis and C. maculatus did not prefer to feed on leaf folder eggs. A. longipennis fed on all the eggs tested along with rice leaves but never on Corcyra eggs.Keywords
Egg Predators, Orthopteran, Rice Insects.- A Study on Five Sampling Methods of Parasitic Hymenopterans in Rice Ecosystem
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PDF Views:150
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
2 Director of Research, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
3 Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
4 Department of Rice, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
5 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore -641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
2 Director of Research, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
3 Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
4 Department of Rice, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
5 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore -641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 32, No 3 (2018), Pagination: 187-192Abstract
For insect diversity studies to be of value, the sampling methods employed must produce samples representative of the community or taxon selected for the investigation. However, as yet, few evaluations on the variability and effectiveness of sampling methods have been undertaken. The survey was carried out in the rice fields during 2015-16 in Paddy Breeding Station, Tamil Nadu Agricultural University, Coimbatore. From this study a total of 1,019 parasitoid individuals were collected. Among six different collection methods employed for sampling hymenopteran parasitoids in rice ecosystem, the yellow pan trap at ground level was found to be the most effective method in trapping the parasitoids (27.2 ± 2.56 parasitoids per day) followed by sweep net method (12.1 ± 1.03 parasitoids per day). The next best sampling method is yellow pan trap erected at canopy level which recorded a mean of 9.2 ± 2.26 parasitoids per day. The other three traps viz., malaise trap, suction trap and light trap were found to collect less number (<1.5) of parasitoids per day.Keywords
Efficiency, Parasitoids, Rice, Sampling, Traps.References
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- Phenacoccus saccharifolii (Green) (Pseudococcidae: Hemiptera) on sugarcane in Tamil Nadu, India
Abstract Views :186 |
PDF Views:101
Authors
N. Geetha
1,
R. Viswanathan
1,
T. Ramasubramanian
1,
K. P. Salin
1,
C. Yogambal
1,
P. Nirmala Devi
1,
S. Karthigeyan
2,
N. Chitra
3
Affiliations
1 Division of Crop Protection, ICAR-Sugarcane Breeding Institute, Coimbatore 641 007, India, IN
2 Division of Crop Improvement, ICAR-Sugarcane Breeding Institute, Coimbatore 641 007, India, IN
3 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, India, IN
1 Division of Crop Protection, ICAR-Sugarcane Breeding Institute, Coimbatore 641 007, India, IN
2 Division of Crop Improvement, ICAR-Sugarcane Breeding Institute, Coimbatore 641 007, India, IN
3 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, India, IN
Source
Current Science, Vol 123, No 9 (2022), Pagination: 1142-1151Abstract
In this study, we report Phenacoccus saccharifolii (green) on sugarcane in Tamil Nadu, India, though an earlier unreported isolated occurrence was observed by us in the farmers’ fields at Pugalur, Tamil Nadu. This pest has now become a major threat to sugarcane cultivation across the state as it can often kill the infested canes with or without the association of the fungal disease, pokkah boeng. Field observations revealed that the ratoon crop was affected more than the plant crop in the same locality. This species was found in large colonies, primarily between the –2 and +1 leaf of the sugarcane plant and hence, named as crown mealybug. Infestation leads to severe mottling in the leaf whorl and death of the central shoot. To the best of our knowledge, there are no earlier studies on the occurrence of this mealybug on Saccharum spontaneum L. Well-developed colonies showed high activity of three encyrtid parasitoids, viz. Aenasius phenococci (Ashmead), Aenasius arizonensis (Girault) and Leptomastix dactylopii Howard in the areas surveyedKeywords
Encyrtid parasitoids, fungal disease, infestation, Phenacoccus saccharifolii, Saccharum spontaneum, sugar-cane.References
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