Dichocrocis

Abstract: The seasonal Occurrence of peach pyralid moth, Dichocrocis punctiferalis Guenee adult, in four main provinces chestnut growing areas were examinated by using light traps on chestnut trees in Gongju of Chungnam, Suncheon of Cheonnam, Jinju and Sancheong of Kyungnam in Korea from 1996 to 1997. Under province condition, they occurred 2 - 3 generations a year. The peak of seasonal occurrence showed 5 times in Jinju chestnut orchards by light trap. But overall data suggest two generations a year in Gongju and Suncheon, and three generations a year in Jinju and Sancheong. The peak of seasonal occurrence of D. punctiferalis adults in the 2nd generation cause a problem at chestnut orchards showed the early of August in Gongju, the middle of August in Jinju and Suncheon, the late of August in Sancheong. Evaluations were conducted by pheromone traps baited with rubber septa impregnated with 2mg of synthetic [ (E)-10-hexadecenal : (Z)-lO-hexadecena1=75 : 25 1 between June and September 1997 on a chestnut tree stand in Micheon-myun, Jinju, Korea. The seasonal pattern in the number of adult caught in the sex pheromone trap was similar to that of the light trap, But, collected effect of peach pyralid moth was the sex pheromone trap in the use of 10 traps per one hector better than the light trap in the use of 1 trap per one hector.

Abstract: This paper studied the difference of niche,as well as inter-specific competition between Ostrinia furnacalis(Guenee) and Dichocrocis punctiferalis(Guenee) in stem and female ear of summer cornThe results showed that the proportion of Ostrinia furnacalis on the stem was approximately equal to Dichocrocis punctiferalis,the number of Dichocrocis punctiferalis was significantly more than Ostrinia furnacali on female earThe distributions of two species on different parts showed that the proportions of Ostrinia furnacali in the lower part of stem and the basal of female ear were more than that in the other places,and the proportions of Dichocrocis punctiferalis in the lower part of stem and the top of female ear were more than other placesThe research showed that Ostrinia furnacalis's niche breadth in the stem was wider than Dichocrocis punctiferalis,it was contrary in the female earThe niche analogy in the stem and in the female ear was 0934 9 and 0742 6,respectivelyThe coefficient of inter-specific competition was 0990 9 and 0873 1 in the stem and female ear respectively,this result suggested that the competition level of Ostrinia furnacalis and Dichocrocis punctiferalis in the female ear was lower than in the stem

Abstract: The defoliation epidemics in the khasi pine forests of Jaintia Hills and Khasi Hill, Meghalaya were studied. The insects responsible for the epidemics were Eterusia pulchella and Dichocrocis puncliferalis . Both the insects are polyphagous and reported for the first time as defoliators of khasi pine E. pulchella is distrihuted all along the Himalayas while D. puncliferalis is widely distributed all over south east Asia including India. Egg, larva, pupa and adult of the species are described and notes on their biology given. Both these insects are potential threat to Pinus kesiya in the region.

Abstract: Dichocrocis puncfiferalis Guenee is a boring pest in Chinese chestnutIt occurs universally,harms seriously,which hinds Chinese chestnut developmentIt is difficult to control that the larvae hide in the fruitThe related researches in recent years are overviewed to lay a theoretical foundation for effectively harmless control in the future