Method for controlling contagion of citrus huanglongbing by utilizing biological factors and application

Abstract

The invention discloses a method for controlling the contagion of citrus huanglongbing by utilizing predatory mites serving as biological factors. The method is characterized by comprising the following steps of: (1) clearing a garden twice every year, namely after tangerines are harvested and when tangerine spring shoots germinate, clearing the garden twice aiming at plant louse and the prevention and control of panonychus citri and other insect pests, so that the insect population of the overwintering plant louse is reduced to the minimum level by using the conventional chemical pesticide for clearing the garden and pruning insect pest twigs; and (2) releasing the predatory mites from middle-to-late March to September every year, wherein the tangerine garden is cleared comprehensively in 7 to 15 days before the predatory mites are released, the killing of the insect pests and the mites and the prevention and control of diseases are performed once aiming at the condition that the diseases, the insect pests and the mites occur in former years in the target tangerine garden, and the used medicaments are chemical pesticides which are used for killing the insect pests, the mites and bacteria effectively and are used conventionally on the market.

Description

technical field [0001] The invention relates to a method and application for controlling the spread of citrus huanglongbing by using a biological factor-predatory mite. Background technique [0002] Citrus huanglongbing (HLB) is a cancer in citrus production worldwide. In recent years, Huanglongbing has spread at a rate of 10-20% in citrus producing areas such as Fujian, Guangdong, and Guangxi in my country, causing great economic losses. At present, the most effective prevention and control measure around the world is to cut down a large number of diseased trees, and the second is to use chemical agents to control the only disseminator of Huanglongbing-Diaphorina citri (Kuwayama). The number of shoots is high and the young shoots last for a long time, especially the fruit-bearing summer shoots are basically not sprayed. The adults of citrus psyllids lay eggs in the gaps between the buds and leaves of citrus after budding. Therefore, spraying alone is used to control citrus...

AI Technical Summary

Problems solved by technology

The citrus shoots are not uniform in time, the number of shoots is high, and the tender shoots last for a long time. In particular, the fruit-bearing summer shoots are basically not sprayed. Spraying alone is not effective in controlling citrus psyllids, and cannot control the population growth of citrus psyllids, which is one of the important reasons why citrus greening disease continues to spread.

On the other hand, there are more than 850 types of pests and diseases in citrus orchards, but only 1-2% of them can cause serious damage. Due to the long-term dependence on chemical control, the biodiversity of citrus orchards has been destroyed, and a large number of natural enemies have caused casualties. Citrus psyllids, citrus red spiders, rust ticks, scale insects, leaf miners, whiteflies, Bactrocera dorsalis and other pests and mites have occurred and outbreaks, and the amount of pesticides has been forced to increase

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