Control techniques of Citrus Black skin Fruit

It is believed that many citrus or lemon growers are no stranger to black fruits, when a serious disease usually occurs in summer or autumn, resulting in sour fruit, black skin, loss of commodity value, resulting in great economic losses. So how to control the citrus black peel fruit? Let's get to know it.

1. Cause of occurrence

Citrus black peel fruit is caused by rust wall lice, also known as rust spider, rust mite, gall mite, adult mites, nymph mites and young mites use stinging mouthparts to stab fruit and leaves to absorb juice. When the oil cells of the fruit are destroyed, the spilled oil is oxidized to brown to dirty black, so there will be a black fruit. And it will also harm the leaves, causing the leaves to be like smoked fruit, when the fruit becomes black-brown, it will miss the best control period, it will not only cause a large number of withered and yellow leaves, cause tree weakness, but also affect the yield in the coming year.

2. Occurrence regularity

The host of citrus rust wall lice is limited to citrus fruit trees. young mites, nymph mites and adult mites can be seen at the peak of their occurrence, and adults are also read in summer and autumn, and transferred to spring shoots and their fruits in the second half of the year. In the first ten days of May, it is harmful to the back of the tender leaves of the spring shoot, and the back of the leaf shows a dark brown reticular pattern after the damage, causing a large number of fallen leaves at the same time. The damage to the fruit began in mid-late May and mid-early June, and the damage to the fruit was serious during the peak period from July to September. In the case of high temperature and high humidity, it was not conducive to the reproduction of rust tick, but in the case of high temperature and drought, the damage of rust tick was aggravated.

3. prevention and control measures

The rust wall lice is very small, white at first, and then yellowish, and when it is serious, there are worms and eggs on the leaves and fruits, so it should be carefully observed in the prevention and control, generally use a magnifying glass to observe the leaves and fruit surface, once a dusty insect body is found, timely spray control. The chemical can choose stone-sulfur mixture, which is an effective agent to control rust wall lice. When spraying, you should first spray the inside and lower part of the crown, and then spray the outside and upper part of the crown, focusing on the shade of the fruit and leaves. Spraying should be chosen after 10:00 and 5 p.m., spraying carefully and carefully, with moist leaves and fruits, but no drops, generally spraying 2 times in a row, each time at an interval of 7 to 10 days.

The above is the introduction of citrus black peel fruit control technology, hope to help you, want to know more related knowledge, please follow us.