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Bacterial Plant Diseases

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Bacterial Ring Rot of Potato

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Symptoms: Chlorosis of leaf margins, wilting, rotting of vascular ring; Causal Agent: Clavibacter michiganensis; Treatment: Use of certified seed potatoes, destruction of infected tubers

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Citrus Canker

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Symptoms: Raised lesions on leaves, fruit, and stems; Causal Agent: Xanthomonas axonopodis; Treatment: Copper-based bactericides, eradication of infected trees

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Bacterial Leaf Spot

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Symptoms: Small, water-soaked spots on leaves, expanding to brown lesions; Causal Agent: Pseudomonas syringae; Treatment: Copper-based bactericides, resistant cultivars

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Fire Blight

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Symptoms: Wilting and blackening of shoots; Causal Agent: Erwinia amylovora; Treatment: Pruning infected areas, applying bactericides

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Common Scab of Potato

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Symptoms: Corky scabs on potato tubers; Causal Agent: Streptomyces scabies; Treatment: Maintain soil pH below 5.2, choose resistant cultivars

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Greasy Spot of Citrus

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Symptoms: Blotchy, greasy lesions on underside of leaves; Causal Agent: Mycosphaerella citri; Treatment: Fungicidal sprays, proper nutrient management

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Bacterial Spot of Pepper and Tomato

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Symptoms: Small, raised, brown lesions on fruits and leaves; Causal Agent: Xanthomonas spp.; Treatment: Copper bactericides, resistant varieties, avoiding overhead irrigation

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Pierce's Disease of Grape

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Symptoms: Leaf scorch, reduced grape yield, vine death; Causal Agent: Xylella fastidiosa; Treatment: Insect vector control, removal of affected vines

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Halo Blight of Bean

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Symptoms: Small, water-soaked spots surrounded by a chlorotic halo; Causal Agent: Pseudomonas savastanoi pv. phaseolicola; Treatment: Use of pathogen-free seed, resistant varieties, copper bactericides

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Soft Rot

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Symptoms: Soft, wet, decay of plant tissues; Causal Agent: Various species of Erwinia, Pectobacterium; Treatment: Proper storage, crop rotation, sanitation

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Bacterial Soft Rot of Potato

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Symptoms: Soft, mushy, foul-smelling tubers; Causal Agent: Erwinia carotovora; Treatment: Proper storage conditions, sanitation, certified seed

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Bacterial Blight

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Symptoms: Wilt, yellowing of foliage, and possible plant death; Causal Agent: Xanthomonas oryzae; Treatment: Resistant varieties, crop rotation, chemical control

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Wildfire of Tobacco

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Symptoms: Irregularly shaped, oily green lesions on leaves; Causal Agent: Pseudomonas syringae pv. tabaci; Treatment: Crop rotation, resistant tobacco varieties, copper-based bactericides

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Angular Leaf Spot of Cucumber

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Symptoms: Small, angular, water-soaked spots on leaves; Causal Agent: Pseudomonas syringae pv. lachrymans; Treatment: Crop rotation, resistant varieties, copper sprays

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Speck Disease of Tomato

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Symptoms: Small, dark spots on leaves and fruits; Causal Agent: Pseudomonas syringae pv. tomato; Treatment: Resistant tomato varieties, copper-based bactericides, proper spacing

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Bacterial Wilt

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Symptoms: Sudden wilting and yellowing of leaves; Causal Agent: Ralstonia solanacearum; Treatment: Crop rotation, resistant cultivars

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Stewart's Wilt of Corn

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Symptoms: Linear lesions on leaves, wilting, stunted growth; Causal Agent: Pantoea stewartii; Treatment: Insect control, resistant corn hybrids

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Bacterial Fruit Blotch of Watermelon

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Symptoms: Water-soaked lesions on fruit and foliage; Causal Agent: Acidovorax avenae subsp. citrulli; Treatment: Seed treatment, crop rotation, sanitation

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Crown Gall

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Symptoms: Tumour-like growths at the base or 'crown' of the plant; Causal Agent: Agrobacterium tumefaciens; Treatment: Applying beneficial nematodes, genetic resistance

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Black Rot

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Symptoms: V-shaped yellowing of leaf margins, blackened veins; Causal Agent: Xanthomonas campestris; Treatment: Crop rotation, resistant varieties, sanitation

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