Biological characteristics and control of Opogona sacchari in Cixi City,Zhejiang Province

There are three generations per year of the Opogona sacchari at Cixi City in Zhejiang Province.Twenty-five hosts belonging to 14 families were damaged by the moth.The larvae spent the winter in the host.The adult moths appeared from the late April to the early June,from the early July to the mid-August,from the early September to the late November.The periods for larva damage were from the early May to the early August,from the early July to the mid-October,from mid-September to late November.The emergence and activity of the adults happened in the night,and the nutrition must be supplied for the adults.The larva had 7 instars and the larvae could be fed by the fresh potato as artificial diet in the laboratory.The behavior of mutually massacres of the larvae was observed.It was an effective way to control the larvae that using 10 percent of imidacloprid diluted 700 times or 1.8 percent of avermectins diluted 1 500 times for spraying plants.When taking 1.8 percent of avermectins diluted 1 000 times to soaking injured Dracaena fragrans,death rate of Opogona sacchari was 97.1% after three days.