-
What are the control methods for potato ring rot?
Ring rot is caused by the bacterium Corynebacterium sepedonicum (potato ring rot corynebacterium). It can occur on stems and leaves as well as on tubers, and can continue to cause damage during storage, causing tuber rot in severe cases. In recent years, with the promotion and application of virus-free seed potatoes, the occurrence of ring rot has decreased significantly. 1. Symptoms Ring rot is also a vascular bundle disease. Aboveground symptoms generally appear after the flowering stage. Initial symptoms appear on the lower leaves of the plant, showing chlorosis between the veins, appearing mottled
-
Symptoms and control methods of potato ring rot
This disease is a bacterial vascular disease, characterized by stunted and wilted aboveground stems and leaves, and ring-shaped rot of underground tubers along the vascular ring. Early and severe infection leads to dead seedlings; most diseased plants grow slowly, are stunted and thin with few branches and small leaves, and the leaves are wrinkled and do not expand; when infection occurs late and is mild, plant height, leaves, and branching grow normally, but the top leaves become smaller, and later one or two branches or the whole plant wilt. Symptoms are most obvious after flowering, with the lower leaves first wilting, drooping, and dying; the upper leaves roll inward from the edges, appear dehydrated, turn grayish green, and then
-
Symptoms and Control Methods of Potato Black Heart
[Disease Diagnosis] Mainly the tuber storage organ is affected. In the central part of the tuber, irregular patterns of black to blue-black form, developing from a spot to a patch into black heart. As it develops severely, the entire tuber can become discolored. The affected black heart area has a clearly defined edge. In the later stage, the black heart tissue gradually hardens. At room temperature, the black heart area can soften and turn ink-black. Different tubers vary greatly in their reaction to black heart. [Cause] This is a physiological disease caused by insufficient oxygen supply to the internal tissues of the tuber, leading to respiratory suffocation.
-
Control Methods for Major Underground Pests of Potatoes
I. Major Pests 1. Mole cricket, also called lala cricket or earth dog. Both the adults (with fully developed wings) and nymphs (with incompletely developed wings) of the mole cricket cause damage to potatoes. It uses its mouthparts and large front claws (forelegs) to tear the underground stems or roots of potatoes into a tangled mass, causing the above-ground parts to wilt or die. It sometimes also bites the seed pieces, preventing the buds from growing and causing gaps in the stand. It tunnels through the soil, separating young roots from the soil and exposing them to air, causing water loss that affects seedling growth and can even kill the plants. In autumn, it bites the tubers, creating holes in them or making them
-
Causes of Secondary Growth in Potatoes and Control Methods
Nilka County has a narrow and long terrain with a cool climate, suitable for the growth of cold-loving crops. Potatoes have always been the dominant main crop in the area. Through years of in-depth investigation and research, technicians have identified the causes of secondary growth in potatoes and the corresponding solutions. I. Secondary growth in potatoes In early August 2003, in Village 5 of Nilka Town, 1.3 hectares of potatoes sown in late April had tubers that had swollen to the size of eggs, the buds on the new tubers sprouted, and small tubers the size of a thumb grew out, while the new tubers grew and aged, no longer continuing to expand.
-
What are the control methods for the white-backed planthopper on rice?
Scientific name Sogatella furcifera (Horvath), belonging to the order Homoptera, family Delphacidae. Distributed in the water bamboo and rice-growing areas of China. Hosts include rice, water bamboo, corn, barley, wheat, sugarcane, sorghum, barnyardgrass, bluegrass, and others. Damage characteristics are the same as those of the brown planthopper. Morphological features: macropterous male body length 3.2-3.8 mm, light yellow, with dark brown spots. Vertex projecting forward; on the outer side of the lateral carinae of the pronotum and mesonotum, behind the compound eyes, there is 1 crescent-shaped dark brown spot; the lateral area of the mesonotum is dark brown
-
What are the control methods for the rice leaf roller?
Rice leaf rolling is caused by the rice skipper and the rice leaf roller. For controlling the rice leaf roller, 34% profenofos-fluorine emulsifiable concentrate is a new-generation insecticide. This product is a new compound ultra-long-acting insecticide with a broad insecticidal spectrum and stable efficacy. Field trials show that spraying 50 ml per mu diluted in 40 kg of water, with a treatment interval of 23 days, achieves a control effect of over 95%, requires 2 fewer applications than conventional pesticides, reduces pesticide cost by more than 50%, and can save 2/3 of labor, truly delivering labor savings, cost reductions, and improved quality and efficiency.
-
What are the control methods for rice kernel smut?
Symptoms Also known as smut, rice dark smut, black kernel smut, etc. It is distributed in the Yangtze River Basin and areas to the south in China, mainly occurring from the flowering stage to the milk-ripe stage of rice, and only infecting the grains. Each panicle may have 1, several, or even dozens of infected grains, with symptoms generally appearing when the rice is near maturity. Infected rice grains turn a dirty green or dirty yellow color, containing black powdery material inside. At maturity, the abdomen splits open, exposing the black powder. Between the inner and outer glumes of the diseased grain there is a black tongue-shaped protrusion, and a black liquid often oozes out, contaminating the surface of the grain. When the diseased grain is opened, the seed can be seen to be partially or entirely transformed into black powdery material.
-
What are the control methods for the rice green leafhopper?
Scientific name Inazuma dorsalis (Motschulsky), synonym Recilia dorsalis (Motschulsky), belonging to Homoptera, family Cicadellidae. Distributed in the rice-growing regions south of the Yellow River. Hosts include rice, corn, sorghum, millet, sugarcane, wheat, barley, etc. Occasionally damages sesame, citrus, etc. Damage characteristics: adults and nymphs pierce and suck sap on rice leaves and leaf sheaths, inhibiting the growth and development of damaged plants, causing leaves to turn yellow or the whole plant to wither.
-
What are the control methods for rice brown spot?
Symptoms Also known as rice sesame leaf blight. It occurs in all rice-growing regions nationwide. Disease can occur from the seedling stage to the harvest stage, and all aboveground parts of the rice plant can be affected, with leaves being the most common. When seeds are affected at the germination stage, the coleoptile turns brown, the sprout fails to emerge, and the cotyledon dies. Leaf and leaf sheath disease at the seedling stage mostly appears as elliptical lesions, the size of sesame seeds, dark brown; sometimes the lesions enlarge and merge into strips, and when there are many lesions the seedlings die. On leaves of adult plants, infection begins as small brown spots, gradually enlarging into elliptical spots the size of sesame seeds, with the center of the lesion brown to grayish white, the margin brown, and around it yellow halos of varying
条件筛选