SOME BIOLOGICAL AND ECOLOGICAL CHARACTERISTICS OF Luthrodes pandava Horsfield INFESTATION ON Cycas revoluta IN VINH CITY, NGHE AN PROVINCE

Abstract

This study provides data for morphological, biological and ecological characteristics of Luthrodes pandava infestation on Cycas revoluta in Vinh city, Nghe An province. Temperature and humidity affecting development time and survival of Luthrodes pandava. The total life cycle of Luthrodes pandava was completed with an average period of 17.7 ± 1.2 days at the 23.0^oC temperature and 84.3% humidity; 19.9 ± 1.4 days at the 21.6^oC temperature and 86.5% humidity. Luthrodes pandava is a major pest of Cycad plants in Vinh city, Nghe An province. Luthrodes pandava appears all year round, reaching its peak in September 2020 with the mean density of 9.73 larvae per tree and damage rate 46.67% and in May 2021 with the mean density of 10.06  larvae per tree and damage rate 51.72%. Studies results on biological and ecological characteristics serve as the basis for more effective control of Luthrodes pandava on Cycas revoluta.