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Johnathan Jones
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2 Part 1: Diseases of Vegetables J. Danny Gay Extension Plant Pathologist Adapted to PowerPoint by George Boyhan Extension Horticulturist Learning Objectives General vegetable diseases Specific diseases of vegetables General insects of vegetables Insect pests of specific vegetables 30,000 Diseases On Economic Plants In U.S. 2

3 CAUSES OF PLANT DISEASES Unfavorable Growing Conditions. Bacteria Fungi Viruses Nematodes ENVIRONMENT CAUSAL AGENT 3

4 HOST causal agent host environment Disease FUNGI Simple plants that lack the ability to produce their own food 4

5 Bean Rust Powdery Mildew Anthracnose 5

6 Lima Bean Anthracnose BACTERIA Minute, one celled plants which lack the ability to make their own food 70 BILLION BACTERIA Ideal Conditions 12 hours 6

7 Bacterial Canker 7

8 Root-knot Damage Cyst Nematodes 8

9 VIRUSES Complex molecules that infect, multiply, mutate, and otherwise act like living organisms while living in plant cells Watermelon Mosaic Virus Alton N. Sparks, Jr., The University of Georgia, Turnip Mosaic Virus 9

10 MOSAICS NECROSIS YELLOWS CRINKLING EXTERNAL SYMPTOMS RINGSPOT VEIN BANDING STREAKING VEIN CLEARING VIRUS TRANSMISSION MECHANICALLY SEED VECTORS (insects, etc.) GRAFTING AND BUDDING POLLEN PARASITIC PLANTS 10

11 DO I HAVE A NEMATODE PROBLEM? 11

12 Rhizoctonia 12

13 Pythium Damping-off 13

14 Bean Rust Sulfur Daconil 2787 Stem Anthracnose Symptoms Leaves Stems Pods Brick Red Blotches 14

15 Anthracnose Control Western Grown Seed Rotation Early Blight 15

16 Early Blight Daconil 2787 Maneb + Zinc Alternaria 16

17 Bacterial wilt Southern blight 17

18 18

19 Tobacco Mosaic Virus Cucumber Mosaic Virus 2,4-D D Injury 19

20 Root-knot Nematode Fusarium wilt Choanephora Pod Blight 20

21 Anthracnose Downy mildew Gummy Stem Blight 21

22 Target-spot Belly-rot 22

23 Bacterial Wilt Powdery mildew 23

24 Squash Mosaic Seedborne Tobacco Insects 24

25 Mosaic Virus Cowpea Mosaic Virus & Southern Bean Mosaic Virus 25

26 Downy Mildew Cercospora leafspot Pale-spot Anthracnose Crater-rot rot 26

27 Part 2: Vegetable Insects Burton R. Evans Extension Entomologist Adapted to PowerPoint George E. Boyhan Extension Horticulturist Preventive Insecticide Treatments 27

28 Extension Publications Pests Damage Identification Control General Pests 28

29 Corn Earworm Clemson University - USDA Cooperative Extension Slide Series,, Corn earworms Alton N. Sparks, Jr., The University of Georgia, Corn earworms 29

30 Tomato Fruitworm/Corn Earworm Aphids 30

31 Aphids Aphids John A. Weidhass,, Virginia Polytechnic Institute and State University, Spider mites 31

32 Spider mite damage Stink Bug Stink Bug 32

33 Stink Bug Damage Okra pods Stink Bug Damage Flea Beetles 33

34 Flea Beetles Beans and Peas Cowpea Curculio 34

35 Cowpea Curculio Damage Cowpea Curculio Damage Mexican Bean Beetles 35

36 Mexican Bean Beetles Lesser Cornstalk Borers Thrips 36

37 Thrip damage Cucumbers, Melons, Squash and Pumpkins Spotted Cucumber Beetle Alton N. Sparks, Jr., The University of Georgia, 37

38 Striped Cucumber Beetle Whitney Cranshaw, Colorado State University, Clemson University - USDA Cooperative Extension Slide Series,, Pickleworm Clemson University - USDA Cooperative Extension Slide Series,, Squash bug 38

39 Squash bug Squash Vine Borer Clemson University - USDA Cooperative Extension Slide Series,, Squash Vine Borer Alton N. Sparks, Jr., The University of Georgia, 39

40 Cabbage, Collards, Broccoli, and Turnips Cabbage Maggot Cornell Cooperative Extension Cabbageworms Cabbage Looper 40

thuringiensis Cabbageworm Diamondback Moth Caterpillar Clemson

41 Cabbage Looper Damage Cabbage Looper Control Cultural Destroy Crop Residue Chemical Sprays or dusts Biological Bacillus thuringiensis Cabbageworm Diamondback Moth Caterpillar Clemson University - USDA Cooperative Extension Slide Series,, 41

42 Cabbageworm Diamondback Moth Caterpillar Cabbageworms - Imported Cabbageworm Cabbageworms - Imported Cabbageworm 42

43 Cabbageworms - Imported Cabbageworm-Eggs Harlequin Bug Sweet Corn 43

44 European corn borer European corn borer Onions 44

45 Onion Maggot Thrips Whitney Cranshaw, Colorado State University, Alton N. Sparks, Jr., The University of Georgia, Thrips 45

46 Potatoes Irish and Sweet Colorado Potato Beetle Leafhopper 46

47 Leafhopper Steve L. Brown, The University of Georgia, White Grub White Grub 47

48 Grub Control Weeding Plowing Treating soil with chemicals Wireworm Steve L. Brown, The University of Georgia, Wireworm Damage 48

49 Tomatoes, Eggplants And Peppers European Corn Borer Cutworms Clemson University - USDA Cooperative Extension Slide Series,, 49

50 Hornworm Whiteflies Whitney Cranshaw, Colorado State University, Whiteflies David Riley, The University of Georgia, 50

DIAGNOSING VEGETABLE PROBLEMS

DIAGNOSING VEGETABLE PROBLEMS DIAGNOSING ARTHROPOD PESTS OF VEGETABLES 2 Primary Injury Types: Chewing Sap-sucking CORN EARWORM Corn: caterpillars feed on new silks & ear tips; reduce pollination & damage