Aiming at the problem of brown blotch Jiangyong County Valencia orange production, the author conducted research in 2010-2013. The results show that, the Valencia orange brown stain shape, there are mainly 6 kinds of color, there are mainly 6 kinds of; pathogen is mainly deficiency, low temperature, premature aging, is a small portion of plant diseases and insect pests; occurrence has 3 peak periods, the occurrence and damage degree and variety, fruit quality, temperature and humidity and low amplitude, management level, maturity related; choose the appropriate species, habitat environment, virus-free seedlings and scion, prevent fruit senescence, timely harvest, can control the summer orange brown stain. |