2015 Volume 2 Issue 2

Influence of temperature on some biological attributes and life table analysis of the tomato leaf miner, Tuta absoluta (Lepidoptera; Gelechiidae)


Mohamed A. M. Osman, Nasser S. Mandour, Mohamed A. Abd El-Hady, Awad A. Sarhan
Abstract

The tomato leaf miner (TLM), Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is a new exotic invasive pest in Egypt and is considered one of the most economically destructive pests of tomato and other solanaceous plants worldwide. The effects of temperature on the biological attributes of TLM were studied at five constant temperatures (15, 20, 25, 30 and 35°C) combined with 60±10% R.H. Results indicated that TLM failed to survive due to the high mortality in cohort reared at 35ºC. Total developmental time was negatively correlated to the increase of temperature; being longest (67.67 days) at 15°C and shortest (14.42 days) at 35°C. Longevity of either males or females decreased as temperature increased. The daily average fecundity of females was 15.78, 18.19, 34.65 and 28.26 eggs at 15, 20, 25 and 30ºC, respectively. The mean total lifetime fecundity of TLM females was 13.92, 211, 244.17 and 177.83 eggs at 15, 20, 25 and 30°C, respectively. Adult survival rates were declined gradually to reach 0% after 11 days post emergence at 30ºC, 17 days at 25ºC, 23 days at 20ºC, and 34 days at 15ºC. Life table analysis showed that the population of TLM reared at 30°C had the highest intrinsic rate of increase (0.75), net reproductive rate (28.28), shortest population doubling time (0.93 days) and mean generation time (4.49 days), comparing to populations reared at 15, 20 and 25°C. Thereupon, the optimum temperature for population growth of T. absoluta ranged between 20 to 30°C.

Keywords: Tuta absoluta; Temperature; Life table; Development; Survival; Reproduction


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Entomology and Applied Science Letters is an international peer reviewed publication which publishes scientific research & review articles related to insects that contain information of interest to a wider audience, e.g. papers bearing on the theoretical, genetic, agricultural, medical and biodiversity issues. Emphasis is also placed on the selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance. Papers on non-insect groups are no longer accepted. In addition to full-length research articles and reviews, the journal publishes interpretive articles in a Forum section, Short Communications, and Letters to the Editor. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.
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