Root rot and stem rot Macrophomina phaseolina Bacterial wilt Pseudomonas solanacearum 1. ROOT ROT and STEM ROT – Macrophomina phaseolina Symptoms The fungus attacks the stem at the nodal region, causing shredding of the bark. In mature plants, necrotic lesions on the leaves appear at the apex and along their margins. Pycnidia are formed on […]
Tag: Pest in cucumber
DISEASES OF LINSEED – Agricultural study materials
DISEASES CAUSAL ORGANISM Rust Melamspora lini Wilt Fusarium oxysporum f.sp. lini Powdery mildew Oidium lini Alternaria leaf spot Alternaria lini Septoria leaf spot Mycosphaerella linorum 1. Rust –Melamspora lini Symptoms The rust may attack all the aerial parts of the plant including the capsules. Diseased plants produce bright orange uredo pustules on both surfaces of […]
DISEASES OF CASTOR – Agricultural study materials
DISEASES CAUSAL ORGANISM Seedling blight Phytophthora parasitica Rust Melampsora ricini Leaf blight Alternaria ricini Brown leaf spot Cercospora ricinicola Bacterial leaf blight Xanthomonas campestris pv. ricini 1. SEDLING BLIGHT – Phytophthora parasitica Symptoms The disease appears as circular, dull green patch on both the surface of the cotyledonary leaves. Later it spreads and cause rotting. […]
Diseases of Cumbu, Pearl, Millet, Bajra – Agricultural study materials
DISEASES OF CUMBU/PEARL MILLET/BAJRA DISEASES CAUSAL ORGANISM Downy mildew or green ear Sclerospora graminicola Ergot or sugary disease Claviceps fusiformis Smut Tolyposporium penicillariae Rust Puccinia penniseti 1. DOWNY MILDEW/GREEN EAR – Sclerospora graminicola Symptoms The first symptom appears in seedlings at 3-4 leaf stage. Affected leaves show patches of light green to light yellow colour […]
Pests On Tuber Crops – Potato, sweet potato – Insects study materials
PESTS ON TUBER CROPS POTATO Cutworms, Noctuidae: Lepidoptera Common cutworm, Agrotis segetum Black cutworm, Agrotis ipsilon Spotted cutworm, Xestia C-nigrum Variegated cutworm, Peridroma saucia Feed on foliage Cut tender stem Larvae remain in soil Larva dark brown in colour Pupates inside the soil Adult – brown fore wings with spots and markings Potato […]
PEST IN CUCURBITATIOUS VEGETABLES – CUCUMBER, WATERMELONS, SQUASH AND PUMPKIN, GUARDS – Free Online Studymaterial
family of chiefly herbaceous tendril-bearing vines (order Campanulales) that are characterized by an inferior ovary and anthers usually united and that include food plants (as the cucumber, melon, squash, and pumpkin), drug plants (as the colocynth), and ornamental plants (as the gourds) Fruit flies (Tephritidae: Diptera) Bactrocera dorsalis: Adult is a reddish-brown fly with lemon-yellow […]