Prevention and control of apricot gum disease in greenhouse
Apricot gum disease is a typical physiological disease, which is caused by many causes, such as hail injury, insect injury, frostbite, sunburn, mechanical trauma, etc., which is easy to cause gum disease in high grafting or branch renewal. Overpruning in summer, improper fertilization, heavy clay of soil, strong acidity, improper use of pesticides and drug damage can induce gum disease. Only by mastering the incidence law of the disease can we achieve effective prevention and treatment. The symptoms, pathogenesis and prevention techniques are introduced as follows:
Symptom
Gum flow mainly occurs on branches and fruits. When tree trunks and branches are killed, transparent gum flows out in spring. After contact with air, the gum gradually turns brown, becomes a crystal soft rubber block, and finally becomes a tea-brown hard rubber block. The glue flow is often swollen, the diseased cortex and xylem gradually turn brown and rotten, and then be infected by saprophytic bacteria, seriously weakening the tree potential. The gum flow of the fruit mostly occurs in the wound, and it sticks to the fruit surface, which leads to the stagnation of fruit growth and the decline of fruit quality.
Pathogen
The pathogen of gummy disease of apricot is several species of Verticillium, which belongs to semi-known fungi, Cladospora and Cladosporiaceae. It is preliminarily determined that the pathogen is a saprophytic bacteria invaded after glue flow caused by physiological lesions, and the phenomenon of glue flow is aggravated after the invasion of the bacteria.
Morbidity regularity
The conidia of the pathogen of the disease invade the wound or glue through the spread of the wind and Rain Water. The pathogen can lurk in the cortical tissue and xylem of the damaged branches, produce conidia in the dead cortex and become the source of infection.
Prevention and cure method
(1) avoid mechanical damage to the tree. In case of damage, the wound should be protected with lead oil preservative in time.
(2) eliminate stem borer in time and control the amount of nitrogen fertilizer.
(3) during the dormant period of the tree, the disease spot was smeared with colloidal fungicide (prepared according to the ratio of 1 kg latex + 100 g 50% bacillus) to kill the pathogen.
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