Population dynamics and diversity of pests and natural enemies in various organic rice regimes across different phenological stages in rice
Authors
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Department of Entomology, College of Agriculture, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad – 500030, Telangana ,IN
M. CHAITANYA -
AICRP on Biological Control of Crop Pests and Diseases, Rajendranagar, Hyderabad – 500030, Telangana ,ING. ANITHA
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Department of Entomology, College of Agriculture, Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad – 500030, Telangana ,INK. R. MAHENDRA
DOI:
https://doi.org/10.18311/jbc/2024/43096Keywords:
Growth stages, insect pests, Oryza sativa, predators, parasitoidsAbstract
A field study was conducted at the ICAR-Indian Institute of Rice Research to investigate insect pest populations and their natural enemies in different organic rice modules during the rabi 2020 season. Three organic rice regimes, farmers’ practice and untreated control were compared across three phenological stages in rice for the population dynamics of pests and natural enemies of Hemiptera and Hymenoptera. Sampling was done fortnightly for three months using various methods such as visual counting, sticky traps, sweep netting, and D-net. Pest and predator populations peaked during the vegetative stage, while parasitoids peaked during the reproductive stage. Pest population means were highest in untreated control during the reproductive and ripening stages exhibiting the impact of treatments. The predator population was highest in untreated control during the vegetative and reproductive stage, while parasitoid population size was highest in Pseudomonas treatment in the vegetative and reproduction stages of the crop and the Trichoderma treatment in the ripening stage. Predator diversity was highest in untreated control during vegetative and reproductive stages of the crop while parasitoid diversity was maximum during reproductive and ripening stage. Pearson’s correlation coefficient between the population of pests and natural enemies was found to be positive and highly significant.
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Copyright (c) 2024 M. CHAITANYA, G. ANITHA, K. R. MAHENDRA (Author)
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Accepted 2024-07-23
Published 2024-10-08
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