Population Dynamics of Rice Black Bug (<I>Scotinophara coarctata</I> (Fabricius)) and Insecticidal Control
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Abstract
The objectives of this research were to study on the population dynamics of rice black bug (Scotinophara coarctata (Fabricius)), to investigate their relationships to some abiotic factors and to determine efficacy of some insecticides to control. The experiment was performed during May, 2017 - April, 2018 at Phitsanulok Rice Research Center. It was found that the number of insects was not found on all plants in the sampling units when using the direct count sampling technique but continuously found when using light traps. The highest average number of insects per week was occurred during December (1,666.14 insects / trap) and lowest on September (0.29 insect / trap). Abiotic factors: relative humidity, maximum temperature, minimum temperature and rainfall affected on the rice black bug population only 0.17, 2.05, 4.79 and 1.63 % (R2 = 0.0017, 0.0205, 0.0479, 0.0163), respectively. The efficacy of 9 insecticides: carbosulfan, clothianidin, ethiprole, etofenprox, lambda - cyhalothrin, profenofos, benfuracarb, prothiofos and triazophos were determined on rice black bug. The result showed that the highest efficacy of insecticide was carbosulfan and clothianidin at 1 hour after application and completely control was occurred at 6 hours after application with LT50 = 0.695 and 0.766 hours, respectively.
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References
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