Population dynamics, spatial distribution and control of Tuta absoluta in the Taigu Region of Shanxi Province
Author of the article:WANG Cai-Feng, ZHAO Jin-Yu, YU Wei-Shuo, YU Qin, MA Li, QIE Xing-Tao, WANG Mei-Qin, ZHANG Dong-Xia,
Author's Workplace:College of Plant Protection, Shanxi Agricultural University
Key Words:Tuta absoluta; occurrence dynamics; spatial distribution; sticky insect boards
Abstract:
Abstract [Aim] To clarify the population dynamics and spatial distribution of the larvae and eggs of Tuta absoluta in the Taigu Region, Shanxi Province, and to optimize the use of sticky insect plates and sex pheromone lures to control this pest. [Methods] Different combinations of pheromone traps and sticky insect plates were hung at different heights in a greenhouse and the number of insects captured in each trap was compared. In addition, the spatial distribution of larvae and eggs on tomato plants was investigated using the "W" shaped sampling method. [Results] The occurrence of T. absoluta was highest from August 28 to September 4 [(404±8.63) ind./7 d] and from October 9 to 16 [(373±13.28) ind./7 d]. Traps hung at a height of 0-25 cm captured the most adult T. absoluta; up to (133±6.56) ind. over 7 days. The color of the sticky plate used had a significant effect on the number of T. absoluta captured; traps used in combination with red sticky plates captured the most [ (1 017±39.12) ind./7 d] and those with white sticky plates the least [(80±9.49) ind./7 d]. Larvae and eggs were mainly found at the entrance of the greenhouse in the initial stage of infestation, gradually moving further inside the greenhouse as tomato damage increased. Larvae and eggs were more widely distributed in ventilated areas at the edge of the greenhouse and less common in the central aisle. Larvae gradually moved from the lower part of tomato plants to the middle and upper parts, whereas eggs were mainly found in the middle and upper parts of plants. [Conclusion] Control of T. absoluta in greenhouses should be focused on ventilated areas on the sides of the greenhouse and at the entrance. Deploying pheromone traps in combination with red sticky plates near the ground can significantly improve trapping efficiency.