Kiwi Phytophthora infestans
In poorly drained orchards and in rainy seasons, the pathogens cause root rot by infecting the cortex with kiwifruit root-neck wounds. In spring or summer, the roots are infested in the soil. A large number of mycelia occurred in about 10 days, and then formed nucleus sclerotia. Severe onset occurred from July to September, and spread ceased after October.
Kiwifruit Phytophthora harm Symptoms
First of all, it harms the outer part of the root. The damaged root cortex is rotted brown and the diseased part is expanding. Finally, the entire root and neck are rotted and rotted, and the smell of distiller's grains causes the whole plant to die. After the onset of the tree, the germination period is postponed, the leaves are withered, the leaf area is small, and the branches are dry. When the damage is serious, the plants die due to the impact on the transport of water and nutrients.
How to prevent and treat kiwifruit phytophthora in kiwifruit
How to Control Phytophthora kiwifruit
1, by re-applying organic fertilizer to improve the soil, improve the structure of the soil pellets, increase the permeability of the soil, maintain the smooth drainage of orchard in the orchard, reduce orchard humidity, prevent the occurrence of diseases.
2, to avoid the construction of low-lying land, in the rainy season or low-lying ridge cultivation.
3, do not plant seedlings, and pay attention to the prevention of root damage during fertilization.
4. The depth of kiwifruit rooting should not be buried in the soil. The trunks that have been deeply planted are soaked and dried in the soil to reduce the occurrence of diseases.
5. Chemical control: In the early stage of disease, it can be cured depending on the severity of the disease, and use soft water through 4000 times +70% Lizhi wettable powder 800 times, or 80% Jinnail seawater dispersible granule 400 times liquid mixture over the trunk Base, upper trunk and branches spray; if necessary, can be used soft water through 4000 times +25% Guinness EC 2000 ~ 3000 times, or 70% Lizhi WP 800 times mixture and other irrigation root; serious condition, carefully scraped In addition to the lesions, they were sterilized with 0.1% mercury-mercuring solution and then smeared with soft water through 600 to 800 times + 25% of Guinness EC 200 to 300 times; the diseased trees were severed and the diseased trees were burned.
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