ASSESSMENT OF THE INFECTION CAUSED BY SOME MAJOR PESTS TO NEWLY HYBRID MAIZE VARIETIES IN SANDY AREAS OF HOANG HOA DISTRICT, THANH HOA PROVINCE

Abstract

Maize in Hoang Hoa district is frequently affected by insect pests, especially by fall armyworm Spodoptera frugiperda, black cutworm Agrotis ypsilon Hufnagel, stem borer Ostrinia furnacalis Guenee; common cutworm Spodoptera litura Fabr and corn aphid Aphis maydis Fitch. In some areas, insect pests cause damage to corn yield by 15-30%. Maize varieties cultivated on sandy soil in Hoang Hoa district are mainly infected by 5 insect pests, of which the fall armyworm, common cutworm and stem borer appear most frequently and cause severe damage. In different maize varieties, occurrence and damage of insect pests are also different. The research of the four maize varieties, CP333 variety is the most severely infected, followed by QT35 variety, and QT55 variety is the least infected one.