Dynamics of Egg Parasitoids of Chilo suppressalis and Its Response to Landscape Structure in Northern Jiangxi

doi:10.16409/j.cnki.2095-039x.2021.09.006

Abstract

Abstract: To explore the bio-control roles of egg parasitoids on rice striped stemborer (SSB) Chilo suppressalis in Southern rice planting areas, we evaluated the dynamics of egg parasitoids and its responses to different landscape structure. Potted rice plant, detached fresh rice leaf, and filter paper with SSB egg mass were compared for their efficiency as sentinel eggs. Field parasitism dynamics of egg parasitoids were investigated using potted rice plants with egg masses in different seasons. Further, parasitism of egg parasitoids in different landscape was investigated on May 6^th, July 1^st and September 7^th using potted rice plants with egg masses for analysis of the relationship between parasitism rate and landscape variables at five different spatial scales (0.2, 0.5, 1.0, 1.5, 2.0 km radius). The results showed that potted rice plants with SSB eggs were the best as sentinel eggs, seconded by detached fresh rice leaves with SSB eggs. Field parasitism was very low on early rice, significantly increased on middle rice, peaking at 66.7% on middle July. After late August, the parasitism rate on late season rice decreased gradually. A close relationship was detected between forest area and egg parasitism rate at 1.5 km scale. When the proportion of forest area was less than 40%, parasitism rate decreased with the increasing of forest area. In contrast, when forest area was more than 40%, parasitism rate increased with the increase of forest area. In conclusion, although proportion of forest area is related to the parasitism rate of C. suppressalis eggs, however, the related effect is not a linear response. The results of this study provide a simple and effective method for evaluation of egg parasitoids of C. suppressalis in Southern rice region, and serve as a reference for the development of integrated pest management strategies by using egg parasitoids of C. suppressalis.

Key words: agricultural landscape, Chilo suppressalis, parasitoids, parasitism rate dynamics, rice

CLC Number:

S476.3

ZHU Yulin, CHEN Junhui, HUANG Xiaolong, XIAO Haijun. Dynamics of Egg Parasitoids of Chilo suppressalis and Its Response to Landscape Structure in Northern Jiangxi[J]. Chinese Journal of Biological Control, 2021, 37(5): 870-876.

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