Abstract
Weeds is one of the remaining problems in the estate crops. Among the top ten noxious weeds is the cogongrass or alang-alang (Imperata cylindrica). The weed is easily dispersed, 60% of its biomass is under the ground and it is difficult to be controlled. Gall forming insect on alang-alang, Orseolia javanica (Diptera: Cecidomyiidae), is thought to have a potential as biocontrol agent. Gall midge-invested alang-alang will grow abnormal indicated by purplish colour, formed of tube-like leaves, and tapped on the end of the rod. A research was conducted to study the cogongrass gall midge distribution in West Java, Central Java, and Yogyakarta provinces as well as its population dynamic in Cianjur district. The distribution of cogongrass gall midge was found in the area with the altitudes of 331-1250 m above sea level. The highest population of the gall midge in Cianjur was 31 galls per m2. There is a positive correlation between population dynamic of the gall midge in Cianjur and the rainfall intensity. The result of this study suggests that the gall formation density is relatively high despite high parasitization by hymenopteran was observed.
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