Bacterial leaf blight

Aristeromycin. Aristeromycin (36), the first carbocyhc analogue of adenosine, was isolated from the culture filtrates of S. citricolor as part of a search for inhibitors of bacterial leaf blight (1—4). A herbicidaHy active hypoxanthine analogue of (36), coaristeromycin, has also been isolated (108). Several chemical syntheses of (36) have appeared (1—4,109). It inhibits Aanthomonas OTjc e and Eyricularia bacterial leaf blight, blast disease of rice plants, and... 

Watanabe, M., Y. Sakai, T. Teraoka, OS026 et al. Novel C19-kaurane type of diterpenes (oryzalide A), a new antimicrobial compound isolated from healthy leaves of a bacterial leaf blight OS027 resistant cultivar of rice plant. Agr... 

The control of bacterial diseases with the currently available products Is very unsatisfactory. The problem has become urgent with the spread of fire blight (Erwlnla amylovora) In Europe, and the Increased Incidence of bacterial leaf blight of rice (Xanthomonas oryzae) and citrus canker (Xanthomonas cltrl) as well as many other bacterial diseases. The direct control of virus diseases Is cur-... 

Fentiazon (74), 3-benzylidenamino-4-phenyl-l,3-thiazolin-2-thion, developed in Japan (Usui and Yamano, 1969), is a folial fungicide with preventive action against the bacterial leaf blight of rice caused by Xanthomonas oryzae. It is not toxic to rice, but is moderately toxic to fish. Its acute oral LOj is 10 000 mg/kg for rats (Anonym, 1967). 

FIG U RE 9.4 The bacterial leaf blight symptom caused by Xanthomonas oryzae pv. oryzae on wild-type (A) andp p-transgenic rice plants (B). 

As conditions require, the above sequence of processing can be stopped at any step. Take Di-ku-Shuang (DKS) (see Table I) for example. It is a new fungicide developed in the early iventies by Sichuan Pesticide Research Institution. It has. .a excellent systemic effect on bacterial leaf blight of rice, which is ranked as one of the major crop diseases in China. 

TDL exhibited excellent activity against rice blast, and the control activity even lasted more than 80 days after treatment. When TDL was applied at 7-20 days before the first appearance of leaf blast, TDL showed stable control activity and was not affected under various field conditions, such as infection pressure of disease, type of soil, depth of paddy water or depth of transplanted seedlings. TDL exhibited additional control activity against some baeterial diseases in field trials, such as rice bacterial leaf blight and grain rot, which suggested that TDL was adaptable to the simultaneous control of a wide range of rice diseases in practical use. 

Selected members of the l,3,4-thiadiazolo[3,2-a]pyrimidine ring system possess larvicidal activity (housefly), protective activity against bacterial leaf-blight disease of the rice plant, and herbicidal activity. ... 

Leaves with spots, blotches, or brown areas. Causes Powdery mildew angular leaf spot scab Alternaria leaf blight other fungal and bacterial diseases. Various diseases attack squash. Reduce problems by keeping foliage dry when watering and by not touching plants when wet. Spray infected plants with a dilute solution of copper spray to reduce the spread of the disease. 

Protection Offered Bordeaux mix acts as a fungicide with insecticidal and insect repellent properties. Use it to control common plant diseases like anthracnose, bacterial leaf spots and wilts, black spot, fire blight, peach leaf curl, powdery mildew, and rust. 

Protection Offered Copper is a broad-spectrum protectant fungicide used to protect vegetables, ornamentals, fruits, and nuts from plant pathogens. Use it in the garden to control anthracnose, bacterial leaf spot, black rot, blights, downy mildew, peach leaf curl, and Septoria leaf spot. 

Fruit with spots flesh may rot. Causes Angular leaf spot Alternaria blight black rot scab other fungal or bacterial diseases. See "Leaves with spots, blotches, or brown areas on page 85 for controls. 

One distinctive symptom of sonre bacterial diseases is the sticky, gummy material secreted by active bacterial cells. If the leaves on your cucumber plant arc wilting and you suspect bacterial wilt disease, cut the stem or leaf stalk with a sharp knife. If you see threads of slime when you pull the stem or stalk apart, this confirms bacterial wilt disease. Active fire blight cankers are covered with a similar bacterial slime. In many cases the bacterial slime has an unpleasant odor. 

The cuticle also provides a barrier to penetration by bacteria, viruses, and many fungi.Enhanced development of a bacterial blight of bean plants previously exposed to simulated acidic rain was thought to have resulted from the creation of infection courts by damage to leaf surfaces by the rainfall, as mentioned earlier. 

Peas can be attacked by a range of pests including pea and bean weevil, pea cyst nematode, aphids, moths, thrips, pea midge, silver Y moth and slugs. Damping off, foot and root rot, leaf and pod spot, downy mildew, powdery mildew, botrytis, virus and bacterial blight can affect the pea erop and may need controlling. 

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