Seasonal Occurrence and Chemial Control Effects of Eriococcus largerstroemiae Kuwana on Persimmon Trees

감나무의 주머니깍지벌레에 대한 발생생태 및 화학적 방제효과

  • 권태영 ;
  • 박소득 ;
  • 박선도 ;
  • 최부술 ;
  • 권용정
  • Published : 1995.12.01

Abstract

This study was conducted to find the control methods, status of overwintering and seasonal occurrence of Erioccoccus largerstroemiae on persimmon trees in Ch'ondo area, Kyongbuk province in Korea. Usually, overwintering eggs were sheltered in bark, among them the rate of alive eggs was 28.7%. The activiation of garpe-myrtle scale showed from late April, and they have three generations per year. The first occurrence of larval stage of Erioccoccus largerstroemiae starts from late June to early July, the second occurrence begins from middle August to late August, and from late June to early July, the second occurrence begins from middle August to late August, and from middle September to late September is the third, thus, three peaks of occurrence revealed in early July middle August, and late September respectively. Average number of eggs conceived in female adult was 229.3. Spray effect of chemical control showed as follows; lime sulfur with tow applications of pesticides (late June, late August) at 97.8%, machine oil with tow applications of pesticides (late June, late August) at 96.8%. And during the growing period, the spray results using three applications of pesticide only (late June, late August, amid September) showed 77.2% in field condition.

Keywords

Persimmon tree;Erioccoccus largerstroemiae;Seasonal occurrence;Integrated pest management