The Newly Sporadic and Major Insect Pests of Orchard Crops in Gyeonggi Province in South Korea

This study was conducted to survey the sporadic and major insect pests of orchard crops in Gyeonggi province in south Korea. The occurrence and rapid range expansion of a L. delicatula has recently been reported in 2004 in south Korea. In vineyards, the grapes is damaged by L. delicatula that sucks the stems and secretes nectar which cause the sooty mold. So the commercial value of grapes is fell down. The hatchability of eggs laid in last year was influenced by the extremely low temperature (especially -20°C and under) in over-wintering season. M. pruinosa is mainly present in Austria, France, Italy, Switzerland, in the Nearctic ecozone and in Neotropical ecozone. The first outbreak of M. pruinosa was reported in 2009 in south Korea. The major orchard crops that being anxious about damage is apple, pear, grapevine and so on. M. pruinosa females insert eggs into cracks in the corky bark of trees and shrubs. The eggs overwinter and hatch in the subsequent spring and nymphs aggregate on twigs and under leaves sucking phloem from their host plants. The first outbreak of Ricania sp. was reported in 2010 in south Korea. This outbreak damaged many kinds of fruit trees such as Cornus, Persimmon and Chestnut. Ricaina sp. host plants included 51 species such as 32 xylophytes, and 19 herbaceous plants.