The latest course on the Control techniques of Citrus Black Fruit

It is believed that many citrus or lemon growers are familiar with black skin fruit, which is a serious disease, usually appearing in summer or autumn, resulting in sour taste, black skin and loss of commodity value, resulting in great economic losses. So how to control citrus black fruit? Let's get to know each other.

1. Causes of occurrence

Citrus black fruit is caused by rust ticks, also known as rust spiders, rust mites, spiny leaf mites, adult mites, nymph mites and young mites with piercing mouthparts to sting people fruit and leaf sap When the oil cells of the fruit are destroyed, the spilled oil is oxidized to brown to black, so black fruits appear. But also harm the leaves, causing leaves like smoked fruit, when the fruit turns dark brown that is missed the best control period, it will not only cause a large number of leaves withered fall off, causing tree weakness, but also affect the yield of the coming year.

2. Rules of occurrence

The host of citrus rust tick is limited to citrus fruit trees. Young mites, nymph mites and adult mites can be seen at the peak of occurrence. Adults can also be seen in summer and autumn. In the second half of the year, they move to spring shoots and fruits to damage them. In early May, it damaged the back of young leaves of spring shoots, and the back of leaves showed dark brown net lines after damage, and at the same time caused a large number of defoliation. In the peak period from July to September, the fruit was seriously damaged. If the weather was high temperature and humidity, it would not be conducive to the reproduction of rust ticks. If the weather was high temperature and drought, the damage of rust ticks would be aggravated.

3. Prevention and control measures

Rust tick insect body is very small, initially white, then pale yellow, serious occurrence of leaves, fruit insects and eggs appear in pieces, so in the control to carefully observe, generally use a magnifying glass to observe the leaves and fruit surface, once found dust-like insect body, timely spraying control. Pesticide can choose stone sulfur mixture, this is an effective pesticide for controlling rust ticks, spraying should first spray the inner and lower parts of the crown, then spray the outer and upper parts of the crown, focusing on the shade of fruits and leaves. Spraying should be selected after 10 a.m. and 5 p.m., spraying should be careful and careful, with leaves and fruits wet but no drops of liquid medicine is appropriate, generally continuous spraying 2~3 times, each time interval 7~10 days.

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