Abstract:

In order to explore the epidemics of Huanglongbing and the regulation of its vector Citrus psyllid, and improve monitoring and control techniques, data of general investigation of disease epidemic of Huanglongbing from October to November in the Citrus orchard all over communities of Linhai County from 2003 to 2010 and the annual population dynamics of vector Citrus psyllid was collecting by applying specific citrus tree timing method in 2 systemic monitoring points in Gucheng and Datian early-maturing citrus orchard during 2008-2010. The results showed that the seasonal population dynamics of citrus psyllid can be described by trimodal curve, its peaks mainly appear at late June to late July, mid-August to mid-September and early October to early November. The tend between different years and orchards were identical, but the peeks and peak times had big differences, these differences mainly influence by first apparition, population base and temperature these three factors. The relationship model of Citrus psyllid chronogenesis of adult and nymph population and temperature can be established as: D=0.018T+17.365 (n=36, r=0.3563*). Based on that Citrus Huanglongbing was transferred by vector citrus psyllid, we developed “a dig two eliminate” prevention and control strategies and the “three against five tests” prevention and control technology. After three years application of these strategies and technology, the disease area of Citrus Huanglongbing was controlled less than 5%. From 2008 to 2010, the disease incidence rate of individual plant was controlled at 0.084%, 0.077%, 0.051%. We basically achieved sustainable control effect and protected the sustainable development of the Citrus industry in Linhai.