Dynamics and Temporal Niche of Tuta absoluta and Dominant Predators in Tomato Fields under Different Planting Modes

doi:10.16409/j.cnki.2095-039x.2025.09.001

Abstract

Abstract: The effects of different planting modes of tomato on the population dynamics of Tuta absoluta and its natural enemies were investigated in open field and greenhouse planting modes in Yuanmou County, Yunnan Province. The population dynamics of T. absoluta and its natural enemies were systematically investigated by 5-point sampling method, and the dominant natural enemies of T. absoluta were screened by dominance index and correlation index. The results showed that the adults and larvae T. absoluta on greenhouse tomatoes reached 10.53 per sticky trap and 8.27 per plant, respectively at the peak date, the highest sex ratio was 2.31, the damage area per leaf reached 41.00%, and the fruit damage rate reached 72.60%, which were all significantly higher than those of the open fields. Five dominant predatory natural enemy species, Orius similis, Nesidiocoris tenuis, Harmonia axyridis, Coccinella septempunctata, and Araneus ventricosus, were found in both of the planting modes. N. tenuis had the largest niche overlap index and correlation with T. absoluta, and the highest population dominance among the predator species. However, the dominance, niche overlap index and correlation degree of the other four natural enemy species were higher in the open field planting than in the greenhouse planting. Planting tomatoes in greenhouses in the areas of heavy T. absoluta damage can lead to T. absoluta outbreak to certain extent, while planting tomatoes in the open field can help increase the population size of natural enemies.

Key words: Tuta absoluta, dominant natural enemies, population dynamics, temporal niche, degree of association

CLC Number:

S476.2

ZHOU Shunwen, DUAN Yongjie, JIANG Zhengxiong, SUN Ying, LI Mingjiang, ZHANG Jinlong, YANG Nian, CHEN Guohua, ZHANG Xiaoming. Dynamics and Temporal Niche of Tuta absoluta and Dominant Predators in Tomato Fields under Different Planting Modes[J]. Chinese Journal of Biological Control, 2025, 41(4): 760-768.

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