Tomato

Leaf Curl Virus

Severe stunting of the plants with downward rolling and crinkling of leaves.The newly emerging leaves exhibit slight yellow colouration and later they also show curling symptoms.The infected plants remain stunted.

Tomato

Bacterial Blight

Infected leaves show small,brown,watersoaked,circular spot ssurounded with yellowish halo.Small,water-soaked spots later become raised and enlarge until they are one-eighth to one-fourth inch in diameter.

Tomato

DAMPING OFF

Young seedlings develop a sunken,necrotic lesion near the soil line.If the lesion girdles the stem,the seedling collapses and soon dies.

Tomato

EARLY BLIGHT

Small,black lesions.Spots enlarge,and by the time they are one-fourth inch in Diamete or larger,concentric rings in a bull's eye pattern can be seen in the center of the diseased area.Tissue surrounding the spots may turn yellow.

Tomato

LATE BLIGHT

Irregular,rather large,greenish-black and water-soaked lesions.These areas enlarge rapidly,becoming brown,and under humid conditions,develop a white moldy growth near the margins of the diseased area on the lower surface of the leaves or on stems.

Tomato

FUSARIUM WILT

Clearing of the veinlets and chlorosis of the leaves.The younger leaves die in succession.The petiole and the leaves droop and wilt.Yellowing of the lower leaves,affected leaflets wilt and die.At later stage,browning of vascular system occurs.Plants become stunted and die.

Tomato

TOMATO MOSAIC VIRUS

Green mottling on the leaves of ten accompanied by wilting of young leaves.The leaflets of affected leaves are usually distorted,puckered and smaller than normal.The virus leaves the yellow streaks in the veins of affected leaves.

Tomato

POWDERY MILDEW

A white powdery coating of the fungal growth appears on the leaf surface.Infected leaves may be dwarfed,stiff,and narrow.The fungus progressively attacks new leaves,spreading over leaf stems,twigs,and even the fruit.Terminal growth of the affected shoot is stunted or killed.

Tomato

BACTERIAL WILT

Rapid and complete wilting of normal grown up plants.Lower leaves may drop before wilting.Infected plant parts when cut and immersed in clear water,a white streak of bacterial ooze is seen coming out from cut ends.

Tomato

BACTERIAL LEAF SPOT

infected leaves show small,brown,water soaked,circular spots surrounded with yellowish halo.Small,water-soaked Spots first appear which later become raised and enlarge until they are one-eighth to one-fourth inch in diameter.Centers of the selesions become irregular,light brown and slightly sunken with a rough,scab by surface.

Tomato

BACTERIAL CANKER

Wilting of leaf lets of affected plants.Light streaks appear at the juncture of petiole and stem extending down the internode and up the petiole.The disease appears on the green fruit as water soaked spots with a white halo.

Chilli

Leaf Curl virus

Upward curling,puckering,and bunching of leaves.The leaves are also reduced in size.Severely affected plants produce fewer,smaller,and deformed fruits.

Okra

Yellow Vein

Yellow veins enclosing island of green tissues.Later stages,the entire leaf turns completely yellow.In extreme cases there is no trace of green colour.At times,enations(raised structures)are observed on the under surface of infected leaf.

Papaya

Mosaic Virus

The leaves are reduced in size and show blister like patches of dark-green tissue,alternating with yellowish-green lamina.The leaf petiole is reduced in length and the top leaves assume an upright position.The infected plants show a marked reduction in growth.

Papaya

Powdery mild dew

Small slightly darkened areas on leaves,which later become white powdery spots.Spots enlarge and cover the entire leaf area.Severely infected leaves may become chlorotic and distorted before falling.Affected fruits are small in size and malformed.

Papaya

LEAFE-BLIGHT

Small , discoloured lesions are irregularly scattered on leaves.Spots become irregular in shape,increase in size,and appear brown to grey .Light yellow zone surrounds spots.Several lesions coalesce covering large areas of the leaf.

Papaya

ANTHRACNOSE

Brown to black,water-soaked spots on the fruit.Centers of these spots later turn black and then pink when fungus produces spores.Flesh beneath spots becomes soft and watery,which spreads to the entire fruit.Small ,irregular water-soaked spots on leaves may also be seen.

Papaya

LEAF CURL

Severe curling ,crinkling and deformation of leaves characterize the disease.Leaves also exhibit vein clearing and thickening of veins.Sometimes petioles are twisted.

Papaya

RING SPOT VIRUS

In severe cases completed efoliation of affected Yellowing and vein-clearing of young leaves followed by very conspicuous yellow mottling of leaves and sometimes severe blistering and leaf distortion.Dark-green streaks and rings also appear in leafstalks and stems.

Beans

Yellow Mosaic

Leaves are severely mottled with alternating light green and dark green patches.Plants are stunted,and fruits are covered with bumpy protrusions.Severely affected cucumber fruit may be almost entirely white.

Potato

LATE BLIGHT

Small pale green spots appear on leaves,which enlarge into large water soaked lesions.A white mildew(cottony growth)ring forms around the dead areas on the lower side of leaves.Tubers develop reddish brown,shallow to deep,dry rot lesions.The affected tuber flesh becomes 'caramalised' with a sugary texture.Metallic tinge develops on the margins of the affected tissue.

Potato

EARLY BLIGHT

Small (1-2mm) circular to oval brown spots on leaves.These lesions become large and angular at later stage.Mature lesions on foliage look dry and papery,and often have the concentric rings,looking like bulls eye.The symptoms on the tuber comprise of brown,circular to irregular and depressed lesions with underneath flesh turning dry,brown and corky.

Potato

POTATO LEAF ROLL VIRUS

infected plants have characteristic pale,stunted and upright appearance with rolling of lower leaves that turn yellow,brittle and are leathery in texture.

CUCURBITS

FUSARIUM WILT

Young seedlings damp off and die.In older plants the plant wilt and die within 10days.Vascular discolaration can be seen.In wet weather, pinkish or whitish fungal growth can be seen on dead stems.

CUCURBITS

POWDERY MILDEW

Symptoms first appear as white powdery residue primarily on the upper leaf surface.On the lower surface of the leaves circular patches or spots appear and spread and cover both the surfaces of the leaves.Severely attacked leaves become brown and shrivelled and defoliation may occur.

CUCURBITS

ANTHRACNOSE

Symptoms appear on the leaf as black spots,which later turn pink in colour.In case of severe infection the disease spread to the developing fruit.

CUCURBITS

MOSAIC VIRUS

Leaves are severely mottled with alternating light green and dark green patches.Plants are stunted,and fruits are covered with bumpy protrusions.Severely affected cucumber fruit may be almost entirely white .

CUCURBITS

DOWNEY MILDEW

Yellow angular spots on the upper surface of the leaves.Under conditions of high humidity,whitish powdery growth appears on the lower surface of the leaves.

CARDAMOM

DAMPING-OFF (RHIZOME ROT)

Pale leaves and yellowing of plant;collapse of seedlings in nursery;more mature plants may exhibit a discoloration and decay of the rhizome;decay causes death of plants.

CARDAMOM

MOSAIC DISEASE

Thin chlorotic flecks on youngest leaves of stem which develop into pale green stripes running from mid rib to leaf margin parallel to veins;all leaves emerging subsequently have stripes;symptoms then spread toall tillers

CARDAMOM

CAPSULE ROT

Water-soaked lesions on rachis;plant dries up beyond point of infection;rotting capsules with a foulodor which fall from plant;water-soaked spots on leaves which enlarge and coalesce.

CARDAMOM

LEAF BLIGHT

Yellow lesions elongate to form necrotic streaks that run parallel to the veins.Several such lesions coalesce to form yellowish-brown to reddish-brown patches,which wither off.Several such lesions develop on both young as well as older leaves which dry up and give burnt appearance to the affected plants.

COTTON

ALTERNARIA LEAF SPOT

Small, pale to brown round or irregular spots measuring 0.5 -3 mm in diameter and cracked centresappears on the affected leaves. Leaves become dry and fall off. The disease may cause cankers on the stem.Theinfection spreads to the bolls and finally fall off.

COTTONS

ANTHRACNOSE

Small,reddish or light coloured diseased spots.Stems are frequently attacked through the wounds and plants are rendered weak.Lint becomes yellow or brown and gets clumped into a mass of fibre.The bolls affected by the disease haves mall,water soaked,circular,slightly depressed,reddish brown spots.

COTTON

GREY MILDEW

Irregular , angular ,pale translucent spots measuring 1-10mm(3-4mm)in diameter and bordered by the veinlets,appear on the older leaves.

COTTON

WILT

Yellowing and browning of the cotyledons.Leaves loose their turgidity first turn yellow and then brown and finally drop off.Browning and blackening Of vascular tissues.

COTTON

BACTERIAL BLIGHT

Angular leaf spot with a red to brown border due to restriction of the lesion by fine veins of the cotton leaf.Spots spread along the major leaf veins.As disease progresses,leaf petioles and stems may become infected resulting in prematured efoliation.