Citrus Hibiscus

Citrus Hibiscus [Diaphorinacitri kuwayama] is a Homoptera, Hibiscus family. It is an important pest during the tender stage of citrus, and it is mainly harmful to citrus. It can also harm Rutaceae and other yellow plants such as Rutaceae.

Hazardous features: Infestation of young shoots, young leaves, and sprouts of adults and nymphs. The young buds of the damaged shoots are shriveled and dry, and the new leaves are distorted. In addition, the excrement of insects is commonly referred to as "milk". It can also induce soot. What's more, the insect has been proved to be the transmission medium for insects of citrus huanglong disease. Therefore, the prevention and control of citrus hibiscus is not only to reduce the number of insects. The need for citrus damage, but also an important part of comprehensive prevention and control of Citrus Huanglongbo to control the spread of the disease.

Morphology? Adults are small bugs about 3 mm in length. All gray-grey, translucent with brown stripes on the front wings, body covered with white wax powder, head sharp, wide in the middle and back chest, the whole insect near diamond. The nymph is flat and oval in shape and has a yellow body, a total of 5 instars, and winged buds. White short wax filaments are secreted around the belly of each instar nymph.
Habits: The worm can occur for 8 to 14 generations a year. In the orange groves of Guangdong, Guangxi, Fujian and Taiwan, various insect stages are observed throughout the year. Adults face the backside of dense foliage, and they begin to sprout in late spring in late February. Spawning breeds, overlapping in generations. The number of citrus aphid larvae was the same as that of citrus shoots. In South China, there are three peaks in the year of the worm, which occurred between mid-March to April, late May to late June, and July to August and September, which are the spring, summer, and autumn of citrus. In the main hair-draw period, the number of larvae on autumn shoots is the most, and the damage is the most serious, which can cause autumn buds to die. In different citrus groves, the number of occurrences of hibiscus is also inconsistent due to different nutrient and propagation conditions. Foodstuffs, climate, cultivation, spraying, and natural enemies activities are the factors affecting the density of woodworm worms, of which foodstuffs are the most important. Without shoots, hibiscus can't lay eggs. Long-term rain is unfavorable to the breeding activities of the hibiscus, and the larvae are significantly reduced. In general, the population density of debilitating trees and Huanglong disease trees is much higher than that on healthy trees. The difference can be as much as 10 to several tens of times. This is because the branches and leaves of the weak and diseased trees are sparsely populated and the shoots are not neat. It is conducive to spawning and breeding of hibiscus.

Citrus hibiscus mostly presents clustered core distribution in citrus groves. Adult worms are not strong in flight, slow to migrate, and less able to move nymphs. Adults have yellowing and red characteristics. According to these characteristics, pest inspections should be strengthened in the prevention and control. Once the insect source center is discovered and insecticides are sprayed in time, pest control can be applied.

The natural enemies of citrus hibiscus are hop beetles, ladybugs, grasshoppers, flower pods, thrips, crickets, crickets, maggots, spiders, and ants. The parasitism rate of parasitoids parasitizing nymphs and cockroaches can be as high as 30% to 50%, which has a certain inhibitory effect on rafts and should be protected and utilized.

Control methods? The following steps should be taken in the prevention and control of citrus hibiscus:
1, agricultural control: 1 do a good orange orange rules to avoid multi-variety planting. 2 Timely deforestation and debilitating trees with loss of ability to reduce the source of insects. 3 Strengthen the management of the tree crown so that the shoots will be drawn neatly, which will worsen the breeding sites for insects.
2. Ecological control: It is mainly to create protective forest belts and create environmental conditions that are not conducive to the propagation and proliferation of wood lice. In the gardens where there is no condition for the creation of shelterbelts, high pole green manure is planted at least between the garden and the rows to hinder the migration and spread of rafts, which can be used to prevent pests and prevent diseases.
3, timely spray protection of new shoots: should grasp the occurrence of insects and the occurrence of the amount based on the report on the basis of each new shoots sprouting about 5 cm when spraying. 95% diflubenzuron aqueous solution can be used 1 000 times, or 20% fenvalerate EC 3 000 times, or 2.5% ET (Deltamethrin) EC 1 000 to 1 500 times, or 50 % Dichlorvos EC 1000 times, or 44% Duo Qing EC 1500 times, or 40% Dichlorfen EC 4000 times, or 2.5% rotenone EC 500 times.

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