Control methods of tomato mosaic disease affected by yellow and green leaves of tomato

Tomato mosaic disease mosaic: showing green uneven mottled, leaves do not become small, not deformed, plants are not dwarfed, which has little effect on yield. The leaves are yellow and green: the leaves are uneven, the new leaves become small, slender, deformed and twisted, the veins become purple, the plants become dwarf, the flower bud differentiation ability of tomato decreases, the flower buds fall, the tomato is small and poor in quality, which has a great influence on the yield, and the yield of diseased plants is lower than that of healthy plants.

Tomato mosaic disease

Pathogenic factors: too much nitrogen fertilizer, too dense sowing, repeated cropping for many years, lack of fertility, poor extensive tillage management, and fields with more tomato virulence residues are prone to disease. There are many poisonous seeds, farm manure, field nematodes and chewable pests, and the disease is serious. Prevention and control methods:

The main results are as follows: (1) reasonable selection of disease-resistant tomato varieties according to local conditions. Do not plant adjacent to tobacco.

(2) when branching, pruning and binding vines, the healthy plant first and then the diseased plant, and the hands that have come into contact with the diseased tomato plant should be disinfected with soapy water to prevent the virus from spreading through agricultural operations.

(3) before sowing, remove weeds in the field and around, concentrate on burning or retting fertilizer, turn the ground deep to kill stubble, promote the decomposition of disease and residue, and reduce pathogens and parasites.

(4) choose fields with convenient drainage and irrigation to plant tomatoes, open good drainage ditches, lower the groundwater level, so that there is no stagnant water in the rain; after heavy rain, clean up the ditch system in time to prevent moisture retention and reduce the humidity in the field.

(5) under the condition of high temperature and drought, we should water scientifically, increase the humidity in the field, reduce the harm of aphids and gray planthopper, and spread grass and moisturize tomato rows, which is beneficial to reduce the disease. Continuous irrigation and flood irrigation are strictly prohibited.

(6) compost made by enzyme bacteria or mature organic fertilizer should be applied to tomato without bacteria-carrying fertilizer, and tomato disease residue should not be contained in organic fertilizer; formula fertilization, proper application of phosphorus and potassium fertilizer, strengthening field management, cultivating strong seedlings and enhancing tomato disease resistance are helpful to reduce the disease.