Now many orange orchards have changed color, found a lot of "African oranges" on the verge of selling, resulting in the rusty spider of African oranges, to the mouth of the meat and lost, can be described as the value of the orange killer, a lot of extensive gardens, the damage is very serious orchards, black peel fruits hanging on the branches. Therefore, some people jokingly call it "African orange".
Citrus rust mites belong to the family Leptosumidae. It is common throughout Guangxi. It is only a pest citrus fruit tree, sucking on the sap of the host leaves, young branches and fruits. The victim fruit first saw rust spots, and gradually became black-brown, so it was called black peel fruit.
Morphological features of the mite body length of 0.1 to 0.2 mm, stubby short spindle-shaped, pale yellow to orange-yellow, with 2 pairs of feet, abdomen with rings, 1 pair of pseudo-feet at the end, its body shape is smaller than that of red spiders, and carrot-like insect bodies can be seen under magnifying glass.
May began to endanger June to October high temperature drought is conducive to the occurrence of rust spider conditions, for the peak period of harm, to November drought will be dangerous, it likes to hide in the shade, often from the lower part of the canopy and the inner chamber leaves and fruits outward or upwards began to occur, canopy shade is conducive to its rust spider reproduction, rust ticks on the fruit initial missed prevention, the harm will be further aggravated, the entire fruit surface due to cell rupture, secretions and air oxidation, the situation deteriorated, and then the drug has no use.
Rust spider on the fruit is not easy to be found in the early stage, when the black peel fruit appears, even if the insect body is killed, the peel will not be restored, long-term large number of frequent use of insecticidal mites, the same mechanism of action, very easy to make the rust spider resistant, copper preparations for the prevention and control of ulcers will also stimulate the growth and development of rust ticks. It is best to have a 30x magnifying glass to check at any time to see the occurrence of rust ticks.
Rust spiders should be controlled from May, and during the peak period from June to October, each medication must take into account the rust ticks, at least once a month to hit the rust spider medicine, and in November, if the temperature is high and dry, it must be prevented.
The drug for prevention and control is recommended not to single-handedly beat lice urea, at least add avermectin or furoxamin for compound use, and the effect of manganese zinc on the prevention and control of rust spiders is very good.
When spraying, the whole tree should be sprayed, the whole tree should be bathed, the leaves should not leak behind the back, and the inner chamber and lower part of the canopy should be sprayed in place.
The above content is a personal opinion, for reference only, please combine the actual situation of your own orchard.
Hello everyone, I'm Xiao Li