Study on aphids, leafhoppers and thrips population in twelve tomato varieties in the field
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Pest population density plays a major role in determining the best time to pest control and first level ofinitial identification of host preference, and pest resistance. Tomato has a wide range of pests that among them sucking are important pest due to indirect damage caused by the transmission of the pathogen, Thrips, aphids, leafhoppers are among them. This study was conducted in randomized complete block design with six replications and 12 tomato varieties involved: Etminan, Aras, AB2, Rio fujiu, Mariana, Gempride, King ston, Super queen, 9704, 9706, 9553 and PS 6515 in field, . Sampling was performed 33 days after transplanting and four tomato plants were selected randomly and the number of the insects were counted every three days. Result showed that the highest and lowest population density of thrips were observed on 9553 in late June 2014 in 6th week after transplanting and Rio in early July 2014, 7th week after transplanting respectively. The highest and the lowest aphids population density were observed on Rio and Marianain late July respectively, in 6th week after transplanting. The highest and the lowest number of leafhoppers were observed on Gempride and King Stone in early July and mid-August respectively, with the 7th and 13th weeks after planting. Investigation showed that the population density of Thrips, aphids, and leafhoppers were varied on different varieties. Based on population density of studied pests, the most important identified species were Frankliniella occidentallis Pergande, Aphis gossypii Glover, Empoasca fabae Harris. Rio, Mariana and King Stone were identified as varietes that had the lowest population density for mentioned pests respectively, and after further studies, they could be introduced as resistant varieties. Dou to the pests population density peaks, appropriate pest management programs would be used.
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