Increasing Rice Yield Loss Associated with Pecky Rice Incidence and Population Growth of Eysarcoris ventralis (Westwood, 1837) in Paddy Fields

Articles in Press

Document Type : Original Research

Authors
Mohammadjavad Fakury 1
Azadeh Karimi-Malati 1
Mahdi Jalaeian 2
1 Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht, Islamic Republic of Iran.
2 Department of Plant Protection, Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Islamic Republic of Iran.
Abstract
Acceptable limits of quantitative/qualitative damages in rice yield induced by stink bugs have recently become more stringent worldwide. Here, population growth, phenology, and yield loss caused by Eysarcoris ventralis were examined in paddy fields (Eshkik village, Guilan). The same-aged eggs were clip-caged, and the life history was recorded. The collected adults of the first spring generation were transferred under mesh cages, and phenological experiments continued until harvesting of ratoon. Furthermore, different pest densities were released on rice plants. After harvesting, the total, empty, filled, and pecky kernels were counted. The head (perfect) and broken rice were also recorded after milling process. The developmental time was 24.24±0.20 days, and fecundity was 65.60±10.84 eggs laid on the flag leaf, kernel surface, and awns. The intrinsic rate of increase (r) was 0.0904±0.006 day-1. The phenological survey showed that the first spring generation completed three other generations, then the fourth-generation adults overwintered. Based on damage assessment, the mean number of pecky rice ranged from 6.67±0.88 to 25.00±2.81 kernels per panicle in control and infestation with nine pests, respectively. The lowest number of non-pecky kernels was 78.36±1.33 kernels in an infestation of nine pests. The mean weight of head rice was inversely related to pest density. Due to a higher number of pecky rice inducing grain breakage, the lowest milling efficiency for head rice was 36.99±0.63% in an infestation with nine pests. Evaluated potential for population increase, together with yield loss even at low pest density, would justify the economic importance of E. ventralis.

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Available Online from 11 May 2026