Diseases Of Cucumber


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Diseases Of Cucumber

  1. 1. Assignment Title:-. Diseases of Cucumber.Presented by,Dinesh DalvaniyaMob. No: 09574031169Email Id: dineshdalvaniya@ymail.com
  2. 2. 1) AnthracnoseCausal organism:- Colletotrichum lagenariumSymptoms:-The disease attacks all above-ground parts ofcucumber, melon, and watermelonFirst symptoms usually appear on older leaves as smallyellowish circular spotsIn warm, wet weather all the leaves may be rapidlyattacked, giving the planting a "burned-out" appearanceStems and petioles are also attacked, and light brown toblack streaks develop.Circular, sunken, water-soaked spots develop on thefruit. These spots turn dark green to brown.
  3. 3. Anthracnose Affected leaves
  4. 4. Life Cycle of Anthracnose
  5. 5.  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.
  6. 6.  Anthracnose fruting bodys Anthracnose facts Seed born Above Ground part infection Spore splashes cause secondary Spred. Resistant variety – Good method Fungicides on sensitive varieties.
  7. 7. 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
  8. 8.  These droplets, after drying for several minutes, will adhere to the skin if a finger is placed on the stems cut end and slowly removed Fig:- Bacterial Wilt
  9. 9.  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.
  10. 10. 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-
  11. 11. Powdery mildew on Cucumber leaf.
  12. 12.  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.
  13. 13. 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
  14. 14.  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.
  15. 15.  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
  16. 16.  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.
  17. 17. 5) Root knot Nematode Casual Organism:-Meloidogyne spp. Symptoms :- The root knot nematodes cause sever galling on cucumber roots.
  18. 18. Root knot nematode infected root.
  19. 19.  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).
  20. 20. Thank you.