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Diseases of Field Crops
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Flashcards
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Cotton Boll Rot
Symptoms: Decay of cotton bolls; Causal Agent: Various fungi and bacteria; Control Measures: Timely harvesting, crop rotation, proper plant spacing.
Bean Rust
Symptoms: Red to brown pustules on bean leaves; Causal Agent: Uromyces phaseoli; Control Measures: Resistant varieties, destroy infected plant debris, fungicides.
Peanut Leaf Spot
Symptoms: Brown spots with yellow halos on leaves; Causal Agent: Cercospora spp.; Control Measures: Fungicide applications, crop rotation, resistant varieties.
Oat Crown Rust
Symptoms: Pustules filled with orange spores on leaves; Causal Agent: Puccinia coronata; Control Measures: Resistant cultivars, fungicides, proper fertilization.
Sweet Potato Feathery Mottle Virus
Symptoms: Mottle and feathering pattern on sweet potato leaves; Causal Agent: Sweet Potato Feathery Mottle Virus (SPFMV); Control Measures: Use virus-free planting material, control of aphid vectors, rogue out infected plants.
Potato Late Blight
Symptoms: Dark, water-soaked spots on leaves and tubers; Causal Agent: Phytophthora infestans; Control Measures: Resistant varieties, crop sanitation, fungicides.
Grape Powdery Mildew
Symptoms: White powdery spots on grape leaves and berries; Causal Agent: Erysiphe necator; Control Measures: Fungicides, good air circulation, vineyard sanitation.
Cucumber Mosaic Virus
Symptoms: Mosaic pattern on leaves, stunted growth; Causal Agent: Cucumber Mosaic Virus (CMV); Control Measures: Use resistant cultivars, manage aphids, rogue out diseased plants.
Tobacco Mosaic Virus
Symptoms: Mottling and distortion of tobacco leaves; Causal Agent: Tobacco Mosaic Virus (TMV); Control Measures: Use virus-free seeds, sanitize equipment, resistant varieties.
Carrot Bacterial Blight
Symptoms: Water-soaked lesions, leaf blight; Causal Agent: Xanthomonas hortorum pv. carotae; Control Measures: Use clean seeds, apply bactericides, practice crop rotation.
Apple Scab
Symptoms: Olive-green to black spots on apple leaves and fruit; Causal Agent: Venturia inaequalis; Control Measures: Fungicide sprays, remove leaf debris, resistant varieties.
Barley Yellow Dwarf
Symptoms: Yellowing and stunting of barley plants; Causal Agent: Barley Yellow Dwarf Virus (BYDV); Control Measures: Control of aphid vectors, resistant varieties, good weed management.
Soybean Cyst Nematode
Symptoms: Stunted growth, yellowing leaves; Causal Agent: Heterodera glycines; Control Measures: Crop rotation, resistant varieties, nematode-free seeds.
Corn Smut
Symptoms: Galls on all aboveground parts; Causal Agent: Ustilago maydis; Control Measures: Resistant varieties, crop rotation, proper fertilization.
Maize Leaf Blight
Symptoms: Long, elliptical gray-green lesions on leaves; Causal Agent: Helminthosporium turcicum; Control Measures: Crop rotation, resistant hybrids, fungicides.
Asparagus Rust
Symptoms: Orange or reddish pustules on spears and foliage; Causal Agent: Puccinia asparagi; Control Measures: Resistant varieties, fungicides, burn infected plant debris.
Sunflower Downy Mildew
Symptoms: Yellow patches and white mold on leaves; Causal Agent: Plasmopara halstedii; Control Measures: Resistant varieties, crop rotation, seed treatments.
Canola Blackleg
Symptoms: Dark lesions on stems and leaves; Causal Agent: Leptosphaeria maculans; Control Measures: Crop rotation, resistant cultivars, seed treatments.
Sugarbeet Root Rot
Symptoms: Rotting of sugarbeet roots; Causal Agent: Rhizoctonia solani; Control Measures: Seed treatments, resistant varieties, proper irrigation.
Onion White Rot
Symptoms: White fluffy mold and black structures on bulbs; Causal Agent: Sclerotium cepivorum; Control Measures: Crop rotation, soil fumigation, good soil drainage.
Sorghum Anthracnose
Symptoms: Reddish-brown lesions on leaves and stalks; Causal Agent: Colletotrichum sublineolum; Control Measures: Resistant varieties, crop rotation, fungicide application.
Tomato Fusarium Wilt
Symptoms: Yellowing leaves, wilting, vascular browning; Causal Agent: Fusarium oxysporum f.sp. lycopersici; Control Measures: Resistant varieties, soil fumigation, good sanitation.
Pumpkin Powdery Mildew
Symptoms: White powdery coating on pumpkin leaves; Causal Agent: Podosphaera xanthii; Control Measures: Fungicides, proper spacing, avoid overhead watering.
Wheat Rust
Symptoms: Reddish to orange blister-like lesions; Causal Agent: Puccinia spp.; Control Measures: Resistant varieties, timely planting, fungicides.
Rice Blast
Symptoms: Diamond-shaped lesions on leaves; Causal Agent: Pyricularia oryzae; Control Measures: Resistant varieties, optimal fertilization, fungicides.
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