The latest control measures of green jujube powdery mildew

Green jujube is a kind of excellent tropical and subtropical fruit. The fruit is rich in nutrition, crisp and sweet, containing a lot of vitamin C, calcium, phosphorus, vitamin B, carotene and other nutrients. When planting jujube, powdery mildew is a big obstacle to jujube production. The disease is common and harmful. How to control powdery mildew of jujube? Let's get to know each other.

1. Symptoms

The powdery mildew mainly damages leaves, fruits and young branches of jujube, mainly fruits in the first expansion stage after fruit damage, followed by young fruits. White hyphae first appear on the damaged fruits and then expand. White hyphae and white powder can be covered in the whole fruit when it is serious. After the fruit is damaged, the pericarp becomes numb, shriveled, brown or yellow-brown, easy to fall off or die. The fruit with mild disease will continue to grow. When the white layer falls off, the diseased part is grayish brown, the pericarp of the diseased part is rough, cracked, dull and cork, which seriously affects the quality and yield of the fruit and brings huge economic losses.

2. Rules of occurrence

Jujube in the whole growth season will cause harm, when the green jujube branches sprout long leaves in April, gradually have bacteria activity harm, damage aggravated in May, after entering June, rainy season, bacteria activity weakened, harm reduced. After the rainy season, the disease begins to occur again in August, and the peak period is September to October. After that, with the temperature decreasing, the pathogen activity tends to stabilize, and sexual spores will be produced to overwinter in litter and soil. When the temperature rises in the following spring, the disease will continue to harm.

3. Prevention and control methods

It is necessary to strengthen fertilizer and water management and enhance tree vigor. During the dormancy period of fruit trees, more than 30 kg of decomposed organic fertilizer and appropriate amount of nitrogen, phosphorus, potassium fertilizer and other chemical fertilizers should be applied per mu. In addition, appropriate amount of micro-fertilizer and biological fertilizer should be added. In the early stage of disease, when white mold layer is found on the diseased leaves, it should be removed in time, at the same time, the garden press should be cleaned, the infection source should be eliminated, the cultivation and weeding should be carried out in time, and the tree should be pruned reasonably to make the permeability good. In dormancy period can be combined with clearing garden, the whole garden spraying a stone sulfur mixture, eliminate overwintering bacteria, disease can be milk fruit powder rust Ling, methyl thiophane, chlorothalonil and other chemicals control. In order to avoid drug resistance, one or two drugs can be selected for mixed use at a time, and the number of times each drug is controlled at about 2-3 times.

The above is the introduction of jujube powdery mildew control measures, I hope to help you, want to know more about the relevant knowledge, please pay attention to us.