Effect of infestation levels of the rice stink bug (Oebalus insularis Stal.) on mechanical damage in different rice genotypes
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Abstract
The stink bug (O. insularis) represents a significant threat to rice production in various regions of the world. This hemipteran causes considerable damage by feeding on developing grains, which facilitates the entry of pathogens that promote spotting, resulting in yield and quality losses of rice. We aimed to evaluate the effect of the infestation levels of the stink bug on mechanical damage in rice genotypes under controlled conditions. For this purpose, a rearing system was established to infest rice genotypes with young adults at levels of 0, 2, 4, and 6 insects per plant, incorporated during flowering. Four genotypes (Go-04209, Go-05070, INIAP FLÉLITE, and INIAP-20) were evaluated in a Completely Randomized Design [CRD]. The variables analyzed were healthy grains per spike, spotted grains per spike, missing grains per spike, and weight of spike per plant. The data were processed using the SPSS statistical program to perform the analysis of variance, the multiple comparisons tests (Tukey 0.05), and correlation analysis. We determined that the higher the infestation, the yield decreases 46%. Hereby, we propose an action threshold of 1 insect per plant to limit the economic loss to 17%. Genotype Go-04209 showed the least affectation compared to the others, standing out in quality and maturity parameters, constituting promising botanical material for genetic improvement and strengthening of productive development against this pest.
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