Why does zucchini cotyledons cause anthrax? What are your tips for preventing it?

It may be because of the lack of water, it may be that the soil is relatively hard, or it may be because there are some pests, these reasons may lead to leaf diseases, usually pay attention to frequent watering, you can spray some mite removal drugs.

Symptoms of Zucchini Root Disease After the roots of zucchini are infected by the disease, the main sites of infection are the roots and rhizomes, which will appear waterlogged at first, then turn light brown to dark brown, and gradually rot. The affected part of zucchini does not atrophy significantly or mildly, and the vascular bundles in the affected area turn brown but do not develop upward, unlike blight. In the later stage of zucchini root disease, the diseased parts of zucchini are mostly rotten, and only the incidence of zucchini root disease is that the common pathogenic bacteria of zucchini root disease usually overwinter in the diseased residue, soil and feces, and can survive for more than 10 years.

It is the main native disease of zucchini roots and is spread through irrigation water, diseased soil, infected manure and farm tools.

It is usually spread by water droplets and running water, and the infection is re-infected in the field. Usually under the conditions of rainy weather, flood irrigation, water accumulation in the field, and poor ventilation and light transmission, it is easy to cause zucchini root diseases. If in terms of management, the use of manure carries bacteria, the fertilization is insufficient, and even the land is easy to induce diseases.

No matter what crop you grow, avoid continuous cropping. In order to improve the soil environment, reduce soil pathogens, improve soil fertility and zucchini yield, zucchini should be rotated and stubble according to the actual local conditions. In the selection of seedlings, the varieties with strong resistance are the mainstay.

How to look at the cultivation of yellow-leaved zucchini, the cultivation method of deep ditch and high ditch can effectively prevent water accumulation in the roots of zucchini plants after irrigation and reduce the humidity of the growth environment. At the same time, it can also thicken the soil layer, improve the permeability of the soil and the temperature of the zucchini root system, which helps to promote the growth of the root system, thereby preventing and reducing the occurrence of dead trees.

Field irrigation or drip irrigation of microbial fertilizers can inhibit the reproduction of harmful pathogens, prevent the occurrence of diseases, reduce the impact of continuous cropping, improve the growth potential and immunity of crops, and fundamentally prevent and control a variety of soil-borne diseases. In conclusion, there are many reasons why zucchini has rotten roots during the cultivation process. Scientific management measures should be taken according to the actual situation, and preparations should be made in advance to prevent root rot and avoid zucchini root rot.

Zucchini soft rot root disease is usually caused by damp and rainy weather, flood irrigation, water accumulation in the field, poor ventilation and light transmission, all of which are prone to disease. Manure carries bacteria, insufficient fertilization, and even cropping plots are easy to induce disease. There are many root-knot nematodes, and agricultural operations can aggravate the disease.

Prevention and control methods: 1. Planting management, avoid planting in rainy and waterlogged, low-lying and waterlogged plots, heavy clay soil, and saline-alkali land. The planting site is soft sandy soil, light clay soil, loose and breathable, and the pH value is slightly acidic soil.

2. Apply more fully rotted farmhouse fertilizer, clean up the sick and residual body in time, and take it out for burning. Deep ploughing, fine soil preparation, and removal of all harmful substances. Rainfall in the short term do not water, watering should be a small amount of many times, not flood irrigation, in addition to pay attention to ventilation, drainage, water accumulation in time to dredge drainage.

It may be infected with fruit rot, infected with sclerotinia and infected with gray mold. Prophylaxis with iprodione when dipping flowers, spraying iprodione or ethylene sclerotinia for development, or using nuclear fumigation agent for smoke control.

Overwintering and primary infection sources. The pathogen overwinters and summers in conidia and ascomycetes on diseased remnants and racks. The surface of the seed can also carry bacteria, and the pathogen is directly harmful to the cotyledons after germination.

Choose the appropriate disease-resistant varieties. Black-seeded pumpkin was used as rootstock for grafting cultivation to enhance disease resistance. Mulching with high ridges or high furrows is used for cultivation, and flood irrigation is avoided during the growing season, and drainage is carried out in time after rain to avoid water accumulation in the field.

Timely control of pests and diseases, avoid sunburn, fertilizer damage, mechanical wounds, physiological tears.

1. Agricultural prevention and control. The selection of planting resistant varieties is an effective method in agricultural control. The cultivation of insect-free seedlings is the key control measure, and insect nets can be used in protected cultivation to prevent the entry of whiteflies.

Adjusting the sowing period to avoid sensitive crops being damaged at the peak of whitefly infestation, and removing residual plants and fumigating residual adults when there is a shortage of fiber, can also reduce crop damage to varying degrees.

2. Biological control. Where conditions permit, aphid wasps can be released to dig vertically and use chlortick in combination.

3. Pharmaceutical prevention and control. The early prevention and control of whitefly is extremely important, and the rational selection of pesticides is still an important emergency means in the early stage of the occurrence of whitefly. Aifudin 2000-3000 times liquid, 40% green cabbage 1000 times liquid, plant-derived insecticide 6% green wave (Nicotian) 1000 times liquid, 25% chloride 1000-1500 times liquid, 10% imidacloprid 2000 times liquid, 5% Ruijinte 1500 times liquid have good control effects.

Sometimes perforated or develop into large yellow-brown spots, with a dark green ring around the lesions, and the leaves quickly yellowing and falling off; Streak-like necrosis is mainly manifested on the branches, the lesions are reddish-brown, expand up and down along the branches, and the diseased parts fall leaves, flowers and fruits, and the whole plant withers when it is severe. Mosaic type: the diseased plant is obviously short, the leaves are shrunken and curly and thick, and the mesophyll is yellow and green and mottled in the shape of flowers and leaves; The dwarf of the mildly diseased plants is not obvious, but the apical heart lobe is more yellow or curled; Severely diseased plants are significantly shorter than healthy plants, and do not flower and bear fruit.

At the beginning of the disease, there are green horn-like spots on the leaves, and finally they turn brown; Diseased leaves appear light green and evergreen flowers; In severe cases, the leaves are deformed and yellow, the plant is short, the flower spikes are short, the flowers are small, and the flower spikes cannot even be extracted. It seriously affects the yield and quality of plants. Many 1 3 mm black-brown water-like spots or whorl spots were formed between the leaf veins, and purple-brown water-stained necrotic spots appeared on the leaf veins and petioles.

This symptom also appears inside the leaf bulb. Some plants have lesions on one side, causing the leaf bulb to be distorted; Some infections occur later in the growth period, and only lesions form on the leaves inside the leaf bulbs.

As the disease progresses, the diseased leaves begin to become smaller, slowly shrink and deform, and the leaf surface appears nodulous and uneven. For plants with early onset, flowers and melons will fall off, and most of them will be directly lost. Diseased plants rarely sit on melons, and melons that can sit are often stunted.

Disease cycle and epidemic Jujube mosaic disease is mainly transmitted through leafhoppers and aphids, and grafting can also transmit the disease. The weather is dry and the leafhoppers and aphids are abundant, and the disease is severe. (4) Prevention and control methods Strengthen the management of jujube orchards, increase the application of organic fertilizers, enhance tree potential, and scientifically use "Tianda 2116" to improve disease resistance.

Apply enough organic fertilizer, appropriate topdressing of phosphorus and potassium fertilizer, enhance disease resistance, timely spraying to eliminate aphids, with 40% dimethoate EC 1000-1800 times liquid, spray once in the seedling field or spray with dichlorvos 1500 times after emergence, every 5-7 days for 2-3 times in a row.

It is systematic mosaic or systematically mottled, with dark green blisters on the leaves, and the upper leaves of the seriously diseased plants are deformed and chicken-paw-shaped, and the plants are dwarfed, and the leaves become smaller, resulting in yellow withering or death of the leaves in the later stage: the diseased plants bear little or no melons, and the melon masks are nodulous protrusions or deformities.

Zucchini mosaic disease is phylogenetic mosaic or physically mottled. There are dark green bracts on the leaves, and the upper leaves of the seriously diseased plants are deformed and chicken-claw-shaped, and the plants are dwarfed, and the leaves become smaller, resulting in yellow withering or death of the leaves in the later stage. The diseased plant bears little or no melon, and the melon mask is nodulous or deformed.

That is, you will find that the leaves are yellow, and there is a gradual combustion, and the area of the leaves is also reduced, and there will also be death.

They are all green spots, and they will slowly turn yellow, and the nourishment is also particularly wilted, and the leaves are relatively small, etc., which are all symptoms of mosaic disease.

The symptom is yellowing, severe will wilt, more serious will die, so be sure to spray pesticides to prevent it.

It is mainly caused by cucumber mosaic virus, melon mosaic disease, zucchini test virus, and pumpkin mosaic virus.

This viral disease, also known as mosaic disease, can also cause harm to fruits and vegetables such as common zucchini, melons, winter melons, and cucumbers. Diseased plants often have aphid activity, strong sunlight or improper management of water and fertilizers, insufficient fertilizers, lack of shoddy management, and are prone to cause viral diseases. Aphids are one of the main causes of viral diseases.

Seeds can also carry viral germs, and the viral diseases carried by our growers while working in the fields will infect damaged plants, and they will be carried in turn with tomatoes and vegetables, and the viral diseases will be further aggravated.

Rotation, preferably with eggplant, fruits, vegetables; Selecting high-quality seeds, soaking them in hot water for 1 hour at 52 and then soaking them in 1% potassium permanganate solution for 30 minutes can effectively remove the virus contained in the seeds. Controlling the spread of aphids with a yellow sticky bug board can reduce damage to banana zucchini. Spring and autumn two open field cultivation, spring early sowing of plastic film seedlings, sowing in late March, harvest on June 6, strong sunshine, high temperature in the summer staggered.

Autumn should also stagger the colonization of the high temperature period so that the temperature of the growing season of the plant is as suitable as possible (around 25). At the same time, we growers should strengthen field management to avoid human transmission. In conclusion, intensive cultivation is the most effective measure to reduce banana zucchini virus disease.

Several viruses such as cucumber petal virus and watermelon petal virus are viral diseases caused by individual or combined infections. Sea leaves and whole plants, the leaves are dark and light green spots, the plant is dwarf, the heart leaves are wrinkled, and the leaves are small. The epidermis of bottled melons produces plaques, tumors protrude, and the whole melon is deformed.

Some leaves are very small, mainly seeds, aphids are transmitted by contact, dry years, there are many mites, and the seeds are easy to get sick when they are poisonous. Viral disease prevention can be sprayed with 10% trisodium phosphate solution for 20 minutes, in time**, sprayed with 20% virus A wet powder 500 times at the beginning of the disease, or 800 times of food barracks emulsion, 7 10 days once, 2 3 times.

A fungal disease caused by the semi-fungal amen gray grape bunche, which mainly damages flowers, cucumbers, leaves and stems. Invade from withered female flowers, causing the petals to rot and develop into milk fruits. Early umbilical cord water stains, followed by soft rot and high humidity, both flowers and cucumbers form a tight gray fungal layer.

The pathogen is mainly hyphae and conidia, which overwinter on the surface of the residue and soil, and spread to air currents, dew, water, and agricultural operations, and it is easy to feel sick when the air humidity is high. Gray mold control can be controlled by spraying 600 times of 50% Suclin humidifying powder, or 400 times of 65% methyl mold, once every 3 4 days, 3 4 times.

Bacterial leaf blight of zucchini mainly damages leaves, sometimes petioles and young stems. Young leaves are infected, the lesions appear in the yellowing area of the leaf surface, but they are not obvious, the back of the leaf appears water-stained small spots, and then the lesions become yellow to yellow-brown round or nearly round, the size is 1 2 mm, the lesions are translucent in the middle, with a yellow halo around them, the pus is not obvious or very little, and sometimes infects the leaf edge, causing necrosis. Before sowing or transplanting, or after harvesting, remove weeds in and around the field, and concentrate on burning or managing

Deep ploughing of the ground to eliminate stubble and dry soil can promote the decomposition of diseased residues and reduce the source of disease and insects.

It mainly damages leaves, and sometimes petioles and young stems. Young leaves are infected, the lesions appear in the yellowing area of the leaf surface, but they are not obvious, the back of the leaf appears water-stained small spots, and the lesions become yellow to yellow-brown round or nearly round, the size is 1 2 mm, the middle of the lesion is translucent, there is a yellow halo around the spot, the pus is not obvious or very little, and sometimes infects the leaf margin, causing necrosis. Disease at the seedling stage can cause the death of seedlings and the expansion rate is fast.

The young stems are infected, some of the base of the stems are cracked, and the sheds are often visible but not harmful. (1) Carry out seed quarantine to prevent the spread of the disease. (2) Seed treatment and pesticide control refer to bacterial horn spot disease of winter melon and knotted melon.

The most common manifestation of zucchini blight is the appearance of small yellow-brown necrotic spots on the leaves, which will gradually turn into small round lesions until the leaves finally die. It is recommended that drugs can be sprayed at the beginning of the disease.