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What are the main types of sesame disease?

Date:2017年08月31日 Number of visits:

Sesame disease a wide range of fungal diseases which accounted for nearly 70%, 20% of the virus disease, bacteria, nematodes, fungi accounted for about 10%. And the city sesame seeds on the occurrence of frequent, serious disease can be divided into three categories:

First, fungal diseases: the main disease endangering sesame seeds

1. Sesame stem spot blight: the main hazards of stem and roots. The stem of the root of the root rot of the root rot; stem damage, the rapid extension of the stem around the formation of brown tubular plaque, the middle of the spot silver-gray, shiny, which gave birth to many small black grain, Rhizome inside the brown, and some rot to empty. Strain is short, leaves up curl, serious when the whole plant withered, can not be strong. Capsules mainly infect inner wall septum, placenta and grain.

2. Sesame Fusarium wilt: Sesame can be susceptible throughout the growth period. Leaves from bottom to top wilting, roots brown, sometimes limited to half of the roots of brown, and the roots to the stem development, so that the corresponding plant half of the leaves turn yellow, withered; stem was long reddish brown spot, wet Department of the disease grow pink mold layer (conidia and mycelium), the root of the catheter brown, and finally caused the leaves wilting, the whole plant withered. General strains shorter than the internode internodes, shorter.

3. Sesame disease: pathogens at any time during the growth of sesame seeds can infect any part of the ground. The initial brown water-like lesions, after the dark brown, wet conditions, the stem base can form a section around the stem constriction spots, capsules will appear mycelial growth, more rain when the disease occurs heavy.

4. Sesame leaf blight: sesame seeds in the late growth of leaves and stems. Leaves on the gray irregular spots, the raw brown mold layer, easy to fall off; stems stems, the formation of the central depression of the reddish brown stripes, causing the plant broken.

5. Sesame damping-off: the main harm seedlings, the typical symptoms of the young stem base side of the dark brown lesions, gradually depression, decay, constriction, causing seedling dead.

Second, the viral disease: Sesame virus disease is perennial sporadic occurrence, the prevalence of individual diseases, the incidence of major occurrences in more than 30%

Field sesame virus disease mainly yellow mosaic virus disease, accounting for more than 70%, the main symptoms of leaf chlorosis, mottled with mosaic and yellowing and other symptoms, severe plant dwarf, the results are less or even not strong. By peanut stripe virus (PStV) invasion caused by viral disease, relying on aphids, water and juice friction transmission.

There are also dwarf necrotic virus disease, shrinkage mosaic virus disease. Other virus diseases are rare, foreign research reports more sesame leaf curl disease in China has not yet found.

Third, the bacterial disease:

1. Sesame leaf spot disease: the main symptoms in the leaves on the formation of dark brown polygonal lesions, dry spots perforation, causing serious leaves of the whole plant litter. Stems and capsules can also be victimized to form dark brown stripes. Cercospora is only confined to the infection of sesame seeds, mainly through the seeds within the survival of winter survival.

2. Sesame bacterial wilt: brown spots appear in the stem, the top prone to ulcers and wilting. High light, from top to bottom whole plant wilting, stem tube bundle black, root rot, leaves can be dark green, oil-like stripes.

3. Sesame leaf spot (also known as bacterial disease): the entire growth period can be infected. Mainly harm the leaves, initially for the gray-brown, water-like necrotic spots, after the expansion to the entire leaf, the lesion for the polygonal.



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