Citrus blastworm is one of the main pests in the growth of citrus. The appearance of peony has seriously affected the yield and quality of citrus. Therefore, farmers should take measures to prevent the disease from happening. The following contents provide a detailed summary of the current status, regularity and comprehensive control measures of citrus worms for your reference.
1. The current situation
The author has repeatedly visited the main citrus towns such as Tanjiawan, Yangxi and Liujing, and the citrus worms are distributed. The orange groves developed in the 70s and 80s are the most serious. Both are above 60%, the rate of insects is generally between 20% and 80%, and about 15% of the large branches of the citrus orchards that are seriously damaging enter the dead period. The annual mortality rate of some orange orchards is over 10%. The situation is very serious. It has caused great concern to leaders at all levels and the majority of orange farmers. Otherwise, a large number of mature citrus trees will die and develop to young orange groves, which will seriously affect the development of citrus industry in Pixian County.
2, the law of occurrence
The worm has a generation in the local 1 year, and the larvae of different ages are overwintering in the trunk, and the mid-March to the end of April are phlegm, and they begin to emerge in the same period. From late May to June, the eggs are laid. Produced in the main crack; after hatching, the larva invades the shallow layer of the bark, and the scattered sesame-sized oil-impregnated rubber dots appear on the bark, and then the gelatinous phenomenon occurs in the affected part, which is the initial symptom of the larva invasion; Later larvae form a layer deeper and feed up or down to form an irregular insect tract. The wormhole is filled with worm feces, which separates the bark from the xylem, the phloem is dry, and the bark bursts. Generally, although orange trees can survive after being damaged, the growth of the tree is poor, and the economic results are greatly shortened. When the insects burst into a ring, the whole plant is dead and loses economic value.
3. Comprehensive prevention measures
3.1 Agricultural control
3.1.1 Qingyuan. Combined with thinning and pruning before April, the dead and dead trees damaged by the blastworms were completely removed, the branches were shaved, and the orange orchards were burned out to reduce the overwintering insect source.
3.1.2 The trunk is painted white. In the winter or May, the trunk is scraped, and the branches are white treated with lime salt water (water: quicklime: stone sulfur: salt = 10:3:0.5:0.5) to reduce the adult eggs.
3.1.3 scrape the larvae. From June to July, the larva hatching period, according to the characteristics of the hazard glue point, use a knife to scrape the newly hatched larvae, and then apply a protective agent to the wound.
3.1.4 Using the fake life of the worms of the worms, shake the trees in the morning of the adult period (the first film under the tree tray), and concentrate on killing the adults.
3.1.5 Promote the use of biological regulators such as islands. Enhance the tree potential and improve the ability of citrus trees to resist insects, disease, stress and increase production.
3.2 Chemical control
First, the adult feathering period, first scrape the victim's skin, then use 48% chlorpyrifos or 72% profenofos EC 200 times liquid spray (paint) trunk or 80% dichlorvos cream mixed with 10-20 times clay, then add water to adjust Paste, applied to the victim, poisoning the adult. Second, in the peak period of adult emergence, use 48% chlorpyrifos EC or 72% profenofos EC 1500 times solution to eliminate adult worms and reduce spawning.
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