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Occurrence regularity and economic threshold of Monolepta hieroglyphica adults in soybean fields
SHI Shu-sen*, WANG Xiao-qi, TIAN Jing, GAO Yu, CUI Juan, ZHU Shi-yu
CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2017, Vol. 39 ›› Issue (2) : 239.
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PDF(1157 KB)
Occurrence regularity and economic threshold of Monolepta hieroglyphica adults in soybean fields
To evaluate the effects of Monolepta hieroglyphica (Motschulsky) adults on the damage to soybean yield loss and the economic threshold of this pest, the agronomic yield characteristics of soybean influenced by M. hieroglyphica in different densities were tested with the method of systemic field investigation and plot grid connection. The results showed that the hazard summit period of M. hieroglyphica adults was during period of July 26 to August 22 in soybean fields, a total of 40 days. During this period, some agronomic yield characteristics of soybean changed, such as: reduced effective pod number, increased rate of empty pod, decreased 100 kernel weight, and the significantly decreased yield of soybean. The relationship of population density of M. hieroglyphica adult and rate of empty pod fitted well to the logistic growth model y=8.720/(1+e(0.7189-0.026 0x)). Equally, a quadratic curve model y=19.6085-0.155x+0.0024x2 indicated the relationship of population density of M. hieroglyphica adult and 100 kernel weight, and a modified exponential model y=53.2078+33.4089×0.9408x(p<0.0001) for soybean yield, a Quadratic function model y=-0.6028+1.8126x-0.0258x2 (p<0.01) for rate of yield loss. Economic loss were 2.81% and 2.91%, and economic threshold were 193.63 bugs / 100 plants and 199.47 bugs / 100 plants, when lambda-cyhalothrin and methomyl were used for controling M. hieroglyphica in present soybean production.
Monolepta hieroglyphica / soybean / economic injury level / economic threshold {{custom_keyword}} /
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