Some study results of longan witches broom syndrome in dong thap

Abstract

Eriophyes dimocarpi Kuang exists mainly on young shoots and other longan witches broom (LgWB) - showing parts of longan. The appearance of E. dimocarpi closely relates to the newly emerging shoots; especially the first and the second new shoots. E. dimocarpi and LgWB always appear together in the field condition, especially in March and April. The pruning method is the best way to remove E. dimocarpi Kuang resource out of the field and to promote the development of new-emerging shoots and flowers. Pruning in combination with fertilizing support new-emerging shoots to rapidly grow, develop and overcome the most susceptible period. Hexythiazox, Fibronil and Quinalphos have high efficacy on E. dimocarpi Kuang.