Diseases Of Cucumber

Assignment Title:-.
Diseases of Cucumber.

Presented by,
Dinesh Dalvaniya
Mob. No: 09574031169
Email Id: dineshdalvaniya
@ymail.com

1) Anthracnose
Causal organism:- Colletotrichum lagenarium
Symptoms:-
The disease attacks all above-ground parts of
cucumber, melon, and watermelon
First symptoms usually appear on older leaves as small

yellowish circular spots
In warm, wet weather all the leaves may be rapidly

attacked, giving the planting a "burned-out" appearance
Stems and petioles are also attacked, and light brown to

black streaks develop.
Circular, sunken, water-soaked spots develop on the

fruit. These spots turn dark green to brown.

 Management
 Preventive measures are important, including use of
good quality seed and crop rotation.
 Chemical methods:-
 Anthracnose control is difficult once the disease is
serious
 The fungicides benomyl and chlorothalonil (Ortho
Multi-Purpose Fungicide Daconil 2787) help to
control the disease, but must be applied at the first
sign of disease or as a preventive.

 Anthracnose fruting bodys Anthracnose facts
 Seed born
 Above Ground part infection
 Spore splashes cause secondary Spred.
 Resistant variety – Good method
 Fungicides on sensitive varieties.

2) Bacterial Wilt
 Causal Organism:- Erwinia tracheiphila

 Symptoms

 The bacteria invade the vascular (water conducting)

tissues of cucumber and melon plants, causing a rapid
wilt of the plant.
 Progressive wilting occurs, beginning with a single leaf

but soon including the entire plant
 The bacterial wilt organism produces a sticky substance

in the vascular tissues that plugs them, preventing the
transport of water
 The bacterial wilt organism produces a sticky substance

in the vascular tissues that plugs them, preventing the
transport of water

 These droplets, after drying for several minutes, will
adhere to the skin if a finger is placed on the stem's cut
end and slowly removed

Fig:- Bacterial Wilt

 Management :-
 Mechanical Methods
 Use resistance varieties.
 Promptly pull up and destroy diseased plants
 Begin control early, as cucumber beetles may
attack as soon as plants emerge from the soil.
 Select less susceptible varieties.
 Apply Admire at planting.
 Foliar insecticides may be needed if beetle
counts are above 1 beetle/plant, wilt is
developing, and the variety is highly
susceptible.

3)Powdery Mildew
 Causal Organism:- Erysiphe cichoracearum

 Symptoms:-

 It is common on cucumber, melon, squash, pumpkin and

watermelon. Powdery white spots develop on the upper
surfaces of older leaves, usually beginning at mid-season or
later
 During hot, dry weather the disease can progress rapidly,

and the upper surfaces of leaves may develop a white
powdery appearance
 Severe powdery mildew causes the leaves to turn yellow

and wither.
 Fruits are not infected, except for watermelon which is

occasionally infected, but fruits may be distorted or sun-

Powdery mildew on Cucumber leaf.

 Favourable Condition
 Less than 60% hot humidity is favourable.
 Management:-
 Chemical Treatment
 Powdery mildew may be controlled with benomyl,
chlorothalonil (Ortho Multi-Purpose Fungicide
Daconil 2787), or dinocap (Karathane) fungicide
sprays.
 Apply the first spray as soon as the disease appears
 Latest chemicals:-Topase @1ml/1lit. Of water spray.

4) Mosaic
 Causal Organism:- Cucumber mosaic virus and

squash mosaic virus
 Symptoms:-

 Leaves are small and puckered, and plants become

severely stunted.
 Cucumber mosaic is very common

 In addition to the mosaic pattern the edges of the

leaves turn down, and the knobs on the fruits are light
yellow

 The cucumber mosaic virus is transmitted from plant
to plant by several different kinds of aphids.
 Cucumber mosaic is readily transmitted mechanically
on the hands of workers in the cucurbit patch and by
aphids.

 Management :-
 Cultural Control
 Mosaic diseases are managed by using good quality
seed and by controlling aphids and cucumber beetles
throughout the season.
 Use Mosaic disease resistance variety seed for
sowing.
 Remove alternate host of aphids.
 Do not plant cucurbits near woods, brushy areas, or
other areas that are weedy. Control all weeds,
especially perennial weeds

 Chemical Control
 Diazinon can be used for aphid and beetle control.
Carbaryl (Sevin) and methoxychlor will also provide
beetle control
 Use care in applying insecticides to tender young
cucurbit plants, as they are easily injured
 Also use of Immedachloprid-17.8%SL.@ 7 ml./10
lit.water.
 Regent @ 7 ml./10 lit.water.

5) Root knot Nematode
 Casual Organism:-Meloidogyne spp.

 Symptoms :- The root knot nematodes cause

sever galling on cucumber roots.

Root knot nematode infected root.

 Management methods
 Physical Methods:- The most important nematode pest
controlled by greenhouse steaming are root -knot
nematodes attacking cucumbers.

 Chemical Methods :-Drill application of carbofuran at
1.5 kg a.i./ha below the seed level reduce the
incidence of Meloidogyne incognita in
cucumbitaceous.

 Integrated Methods :- Combine inoculation of
AMFand Pseudomonas fluorescenshad had
possitiveeffect on root-knot nematode control on
cucumber(Jakobsen,1999).

Diseases Of Cucumber

More Related Content

What's hot (20)

Viewers also liked (20)

Similar to Diseases Of Cucumber (20)

Recently uploaded (20)

Diseases Of Cucumber