Document Type : Agricultural Entomology
Author
-Associate Prof., Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht Iran.
Abstract
Rice striped stem bore has been active as a dangerous pest in the rice fields of the country except for Khuzestan province for nearly fifty years and causes damage to the rice plant every year if it is not controlled. This research was conducted to determine the effective daily temperature, the effect of environmental factors on the biology of the pest and the number of pest generations. The results of this research showed that all environmental factors, including temperature, relative humidity, sunshine hours and rainfall, as well as day length, had an effect on the life of the stem-eating pest. The results of this investigation showed that the average total effective temperature for the rice stem borer during four years was about 822 days-degree according to the meteorological data. The average of the total temperatures required for the life stages of the rice stem borer to separate the eggs, larvae, pupae and adult insects were in the range of 70, 551, 104 and 92 degree days respectively. The results of the research showed that if the adult insect receives a temperature of more than 90 degree-days, as a result, by receiving the mentioned amount, it has the ability to enter the egg stage. One of the most important climatic elements in the life of the striped stem borer pest related to adult insects was the temperature between 22 and 32 degrees Celsius and sunny hours, relative humidity and temperature for egg clusters, for larvae, temperature and relative humidity related .
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