<h1>Plant virus diseases:</h1>
Diseases caused by parasitism of plant viruses. Plant viruses must live parasitically within host cells, where nucleic acids (RNA or DNA) and protein shells are replicated to form new viral mitochondria. Plant virochondrials or viral nucleic acids transfer slowly between plant cells, while in vascular bundles they can be rapidly transferred with the direction of nutrient flow of plants, causing disease around the plant.
<h1>Symptoms of onset:</h1>
1. Discoloration. Plant vascular bundles are destroyed by viruses, and the formation of chlorophyll in leaves is blocked or accumulated, resulting in flowers, spots, ring spots, vein bands and yellowing; the anthocyanins of flowers can also be changed, making the flower color green or variegated.
2. Necrosis. Causes plant cells or tissues to die, turning yellow to brown and sometimes denting. Necrotic spots, necrotic rings and vein necrosis are often present on the leaves, and necrosis strips often appear on the surface of stems, fruits and roots.
3. Deformity. It leads to deformation of plant organs, such as shortening between stems, dwarfing of plants, abnormal differentiation of growth points to form tufts or clusters, and local cell deformation of leaves appears blisters, curls, fern leaves and yellowing.
tomato
<h1>Route of transmission:</h1>
1. Spread with the help of toxic propagating materials such as scion, bulb, root, tuber, etc., and introduce new plant bodies after grafting.
2. Spread through insects, mites, fungi in the soil, nematodes and other vectors. Poisonous insects are mainly sucking mouthpart pests, such as aphids, leafhoppers, planthoppers, thrips, whiteflies, etc.; only a few have chewable mouthparts. They spread the virus from the diseased strain to the healthy strain while harming the plant. Therefore, while preventing and controlling viral diseases, it is also necessary to do a good job in the prevention and control of aphid whiteflies.
aphids
<h1>chemical control:</h1>
Morpholine guanidine hydrochloride is used for the medical prevention and control of virus-caused diseases, and is also widely used in agriculture, such as vegetables, melons and fruits and tobacco and other crop virus disease control. Morpholine guanidine hydrochloride is used in the control of plant virus diseases as follows:
<h1>1. Morpholine guanidine hydrochloride + propythionazole</h1>
16% morpholine guanidine hydrochloride and 2% propylene sulfur can be mixed, propylthiocarbendazim is a low-toxicity, systemic benzimidazole fungicide, which can effectively prevent the synthesis of pathogenic bacteria adenosine triphosphate, has a protective and therapeutic effect, and inhibits the germination of pathogenic spores. Morpholine guanidine hydrochloride has an internal suction and therapeutic effect, which can enter the plant through water pores, inhibit or destroy the formation of nucleic acids and lipoproteins, block the replication process of the virus, and play a role in preventing and controlling the virus. The two are mixed and can be used to prevent and treat tobacco virus disease.
The dosage of tobacco virus disease prevention and treatment preparations is 63-75 g/mu, sprayed by application method, and sprayed evenly with water in the early stage of tobacco virus disease onset. It is necessary to pay attention to the toxicity of the red-eyed wasp, and the release area of natural enemies is prohibited; it is poisonous to aquatic organisms such as fish, and it is not allowed to pollute all kinds of waters.
Tobacco virus disease
<h1>2. Morpholine guanidine hydrochloride + enoadenine + hydroxyten adenine</h1>
Using a mixture of 0.002% enoadenine, 0.002% hydroxyten adenine, 39.996% morpholine guanohydrin hydrochloride, after the diluted solution is sprayed to the foliar surface of the plant, the agent can enter the plant through water pores, inhibit or destroy the formation of nucleic acids and lipoproteins, block the replication process of the virus, and play a role in preventing and controlling the virus. And can stimulate plant cell division, promote chlorophyll formation, accelerate plant metabolism and protein synthesis, so as to achieve rapid growth of organisms, promote early maturation and yield of crops, and improve plant disease resistance and cold resistance.
The dosage of the preparation for the prevention and control of tomato virus disease is 100-150 g/mu, and the dosage of the rice black stripe dwarf disease preparation is 125-150 g/mu, and the spray is applied. Use at the beginning of the disease, once every 7-10 days, 2-3 times continuously. The safe interval for use on tomatoes is 5 days and 21 days on rice. The concentration is not less than 300 times when used, otherwise it is easy to produce drug damage.
Tomato virus disease
<h1>3, 10% morpholine guanidine hydrochloride + 10% succinate copper</h1>
This mixture plays an antiviral effect by inhibiting the synthesis of viral nucleic acids and proteins. Prevention and treatment of tomato virus disease in the early stage of the disease, use 150-250 grams per acre of preparations, foliar spray of 45-75 kg of water, spray every 7-10 days, all the growth period is applied 2-3 times or depending on the condition, the safety interval is 5 days.
<h1>4, 16% morpholine guanidine hydrochloride + 4% copper acetate</h1>
After the diluted liquid is sprayed to the foliar surface of the plant, the agent also enters the plant through the water pores, inhibits or destroys the formation of nucleic acids and lipoproteins, prevents the replication process of the virus, and plays a role in preventing and controlling the virus. For the prevention and treatment of tomato virus disease, the dosage of the preparation is 167-250 g /mu, and it is sprayed with water. The drug should be administered at the beginning of the onset of viral disease, on windy days or when rain is expected within 1 hour, and should not be administered. Do not abuse or use immediately with substances such as alkaline pesticides.
Note: Due to the occurrence of diseases, insects and grass pests in various places, the level of medication, and the environmental climate are different, the technology used in the text is for reference only, if you need practical application, please consider it according to the local conditions. Micro-agricultural materials, pay attention to those things of agricultural materials!