Guava Cultivation Techniques and Pest Control: Nematode Diseases
2018-06-29 23:00:51
8. Diseases and Occurrence of Guava Nematode (1) Injury and Occurrence Rules Guava plants are affected by nematode infection. The nematodes that cause guava are mainly nematodes and nematodes. Both Nematoda and Nematodes invade the roots of guava and cause nodules. Or root rot. The damaged guava plant had poor fertility, the leaves became smaller, yellowing, and internode shortening. In severe cases, the leaves appeared iron deficiency-like disease, and the new shoots turned dark, and the leaves adjacent to the sprouts appeared yellowish-white. When the guava seedlings are victimized, it is easy to discriminate between the infection and the healthy plants. The guava roots damaged by the above two nematodes could easily see root nodules or rot. When the density of nematode nematodes was high, root nodules were also found in the roots of weeds in guava field. In addition to the guava roots being harmed by nematodes, many years ago, the existence of nematodes was found on the guava fruit. When the pathogen was isolated from the brown spot of mature guava fruit, the nematodes were found accidentally. In recent years, due to the technical advancement of guava orchard cultivation management and bagging, the presence of wired worms on fruits has not been observed. (2) Prevention and control methods For guava nematode control, drugs such as dichloroisopropyl ether, didisulfone, and Benzonin can be directly sprayed or diluted and then poured into the root surface of the damaged plants to kill nematodes. The effect is more direct. When the groundwater level of the orchard is very high or is likely to be flooded, the breeding of nematodes is not easy and the disease development is relatively slow after infection, which is not as serious as the dry land. Rotation flooding, such as crop rotation with rice, should reduce guava nematode damage. Soil treatment before planting can use a mixture consisting of 3 ml of Miller, 10 g of Yishubao and 5 grams of iron extinction. The killing effect is good, but care should be taken not to apply it in high water areas. China Agricultural Network Editor
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