Articles

Relationship between physical-chemical characteristics of corn kernels and susceptibility to Sitotroga cerealella


Abstract


The Angoumois grain moth, Sitotroga cerealella Olivier (Lepidoptera: Gelechiidae), is a stored-grain pest distributed worldwide. Interaction relationships between physical-chemical characteristics of plants and insects have been found, and this interaction has great potential to be used in integrated pest management strategies. Therefore, our laboratory studies aimed to assess i) the susceptibility of five corn (Zea mays L) genotypes (UFVM100, UFVM200, UFVM100X200, AG1051 and DKB747) to S. cerealella and, ii) the correlation between physical-chemical characteristics of corn kernels and moth performance. In this study, kernels of five corn genotypes were evaluated for their comparative susceptibility to S. cerealella. Developmental period, progeny of emerging adults and kernel weight loss were taken the parameters adopted for this test. S. cerealella led to longer development period, shorter survival percentage and lower kernel weight loss percentage on AG1501 genotype. A strong positive correlation between kernel weight loss percentage and protein content was observed. A strong negative correlation was observed between development period and kernel weight, moisture and protein contents. Additionally, a negative correlation was found between survival percentage and kernel hardness. Our study leads to the conclusion that development period, progeny of emerging adults of S. cerealella and kernel weight loss were related to some kernel characteristics. Thus, this information may be used as a tool in integrated management programmes and plant breeding programmes for S. cerealella.

Keywords

Angoumois grain moth; development; survivorship; stored grain; resistance; grain weight loss ANgou

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