Red spiders, notorious in agricultural production, can invade many fruit trees, vegetables and flowers. Unfortunately, our protagonist today, citrus, is also infected, so what should we do? The critical period for controlling citrus red spiders is between germination and flowering in the spring. Pay attention to the rotation and mixing of medications and take appropriate concentrations. Adult trees should grasp the early spring and late autumn, and nurseries and young trees should strengthen winter prevention and control in addition to spring and autumn.
1. Take pre-spray prevention and control, and protect predators in the later stage
After fruit picking and the time before the flowering of citrus, the number of insect mouths in winter is directly related to the insect situation in the coming year, and the density of the insect mouth is reduced to less than 10 heads per hundred leaves in winter spraying, which can make the plant not cause leaf-leaving dead branches due to mites before flowering.
After the flowering, the number of natural enemies increases, should try not to spray drugs comprehensively, especially highly toxic pesticides and Bordeaux liquid, etc., should be changed to general treatment to pick treatment, control the source of insects occurrence center, suppress the density of pest mite mouths, in order to protect natural enemies.
In winter- dry and spring drought years, irrigation should be carried out in time to ensure that the citrus orchard has sufficient moisture and humidity, and to ensure that the spring shoots are pumped, which is conducive to the occurrence and epidemic of natural enemies and parasitic bacteria, resulting in unfavorable environmental conditions for citrus red spiders, in order to alleviate its harm. If some plants cause discoloration of new shoot leaves due to loss of control, 0.5% urea can be added to the medicinal solution as extra-root topdressing to enhance plant nutrition, promote leaf greening, and reduce its harm.
2. Use of chemicals for prevention and treatment
Use avermectin +40% acetomonium. Spironoid esters completely kill red spiders
Ethiazole is a broad-spectrum mite of special structure, which inhibits the formation of mite egg embryos and the peeling process from young mites to adult mites, is effective for eggs and young mites, and has a good infertility effect on female adult mites. Strong rain resistance and long shelf life. Spironite ester is a new quaternary ketoacid broad-spectrum insecticide acaricide, and the current acaricide has no interaction resistance, mainly inhibits the fat synthesis of mites, blocks the energy metabolism of mites, has a good killing effect on the eggs, young mites and mites of pest mites, and has the effect of inhibiting the hatching rate of female mites spawning, and has a long effective period.
Avermectin has stomach toxicity and touch killing effect on mites and insects, and adult mites and nymphs appear paralyzed after contact with avermectin, and die from inactivity and non-feeding.
The control spectrum has been expanded, the egg killing effect is outstanding, and it has significant lethality to various fertile mites, and the mites are cleaner.
3. Protect predators
Between March and May and September to October, on orange trees with an average population of less than 2 heads per leaf, each plant releases 200-400 Nylonite blunt mites or New's blunt mites, which can be effectively controlled about a month after release. When the prey density is too high, the control effect of Nyssii blunt mites is better than that of Nylonnes obtussus mites, but the field population of Nylonnes blunt mites is more stable than that of Nyssii blunt mites. Spraying of highly toxic pesticides after the release of insects in citrus orchards is strictly prohibited.
There are many kinds of natural enemies of citrus red spiders, there are nearly 100 species, of which the main predatory mites are: New's blunt mites, Nishi's blunt mites, Largo blunt mites), De's blunt mites, large red mites, tumor-bearing long-bearded mites, etc. 6 species; mite-eating ladybugs are: deep-point mite-eating ladybugs, Guangdong mite-eating mites Ladybug, Tube Mite Ladybird, Bundle Tube Mite Ladybird, Black Sac Mite Ladybird), Quasi-small Mite Ladybird, Binchuan Mite Ladybird, Yunnan Mite Ladybird), Guangxi Mite Ladybird; in addition, there are grasshoppers, whiteflies, carnivorous thrips and some beneficial microorganisms. These days the rival citrus red spider has a significant inhibitory effect and should be protected and utilized.
Source: Toutiao [Suiyang Agricultural Science]