Cucurbit Integrated Crop Management

Cucurbit Insect, Disease, and Weed Photos

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Figure 1. Seed maggots

Figure 2. Wireworm

Figure 3. Grub



Figure 4. Cucumber beetle larvae

Figure 5. Cucumber beetles

Figure 6. Squash bugs

Figure 7. Squash bug eggs

Figure 8. Aphids

Figure 9. Thrips



Figure 10. Squash vine borer

Figure 11. Larva of the pickleworm

Figure 12. Melonworm

Figure 13. Spider mites

Figure 14. Anthracnose on watermelon leaf

Figure 15. Anthracnose on watermelon stem

Figure 16. Anthracnose on watermelon fruit

Figure 17. Bacterial fruit blotch of watermelon (Coutresy K. Rane, Purdue Univ.)

Figure 18. Bacterial leaf spot on watermelon leaf

Figure 19. Bacterial leaf spot on pumpkin leaf

Figure 20. Bacterial leaf spot on pumpkin fruit

Figure 21. Wilt symptom on cantaloupe vine

Figure 22. Diagnosis of bacterial wilt of cantaloupe

Figure 23. Cercospora leaf spot on watermelon

Figure 24. Downy mildew on cantaloupe leaves

Figure 25. Downy mildew on watermelon leaf

Figure 26. Cross section of watermelon crown with left- phloen discoloration from yellow vine, center-xylem discoloration from Fusarium wilt, and right- healthy

Figure 27. Gummy stem blight on watermelon leaf

Figure 28. Gummy stem blight lesion on cantaloupe stem

Figure 29. Distorted vine growth caused by a mixed infection of mosaic viruses on pumpkin

Figure 30. Watermelon mosaic virus on watermelon leaf

Figure 31. Mosaic virus symptoms on squash fruit, left healthy, right diseased

Figure 32. Crown rot phase of Phytophthora blight of squash

Figure 33. Powdery mildew on pumpkin leaves




Figure 34. Rind necrosis of watermelon

Figure 35. Root-knot nematode on cantaloupe

Figure 36. Yellow vine of watermelon

Figure 37. Small-seeded annual weeds becoming established in a cucurbit planting. A combination of several procedures may be needed to control all weeds found in crop.




Figure 38. Seedlings of (A) Hophornbeam Copperleaf (Acalypha ostryifolia), (B) Woolly Croton (Croton capitatus), and (C) Common Lambsquarters (Chenopodium album). Annual broadleaf weeds such as these may be difficult to control in cucurbit crops.

Figure 39. Seedlings and flowering plant of Carpetweed (Mollugo verticillata), a weed found in many cucurbit fields in Oklahoma.

Figure 40. Seedling of Cutleaf Groundcherry (Physalis angulata). Annual broadleaf weeds such as this one are most easily controlled by cultivation while plants are small.

Figure 41. Two of several pigweeds found in cucurbits: Tall Waterhemp (Amaranthus tuberculatus) (large leaves) is one of several pigweeds that may reach five feet or more in height. Tumble Pigweed (Amaranthus albus) may reach 2-3 feet in height and is highly branched.

Figure 42. Horsenettles (Solanum carolinense and S. demidiatum), are perennials that can vary in leaf form and flower color. Thorns may interfere with field procedures.

Figure 43. Eclipta (Eclipta prostrata) is a broadleaf weed of increasing importance.

Figure 44. Removal of broadleaf weeds that escape cultivation is limited to manual means.