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Diseases- Weeds- Insects & Other Problems-C102

  • Vine Crops Disorder: Bacterial Wilt
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    Vine Crops Disorder: Bacterial Wilt

    Author(s) Karen Delahaut, Walt Stevenson. Bacterial wilt, caused by Erwinia tracheiphila, is a destructive vascular disorder spread by cucumber be...

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  • Vine Crops Disorder: Anthracnose
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    Vine Crops Disorder: Anthracnose

    Author(s) Karen Delahaut, Walt Stevenson. Anthracnose is a destructive fungal disease of the foliage, stems, and fruit of cucumbers, gourds, muskm...

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  • Vegetable Leafminers
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    Vegetable Leafminers

    Author(s) K. A. Delahaut.  Leafminers are the larval stage of flies, moths, sawflies, and beetles that often cause damage to leafy edible plants s...

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  • Vegetable Aphids
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    Vegetable Aphids

    Author(s) K. A. Delahaut.  This fact sheet covers vegetable aphids, including the bean, pea, green peach, melon, potato, cabbage, and corn leaf ap...

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  • Tomato Disorder: Post-Harvest Fruit Diseases
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    Tomato Disorder: Post-Harvest Fruit Diseases

    Author(s) Karen Delahaut, Walt Stevenson. Even though symptoms may not appear until after harvest, many of the disease-causing organisms that caus...

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  • Squash Vine Borer
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    Squash Vine Borer

    Author(s) K. A. Delahaut.  The squash vine borer is an annual pest of pumpkins and squash. Winter squash are especially vulnerable. This fact shee...

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  • Squash Bug
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    Squash Bug

    Author(s) K. A. Delahaut. Squash bugs are a problem in Wisconsin, feeding on most vine crops such as pumpkins and squash in commercial and home ga...

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  • Potato Leafhopper
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    Potato Leafhopper

    Author(s) K. A. Delahaut. In Wisconsin, the potato leafhopper (Empoasca fabae) is a serious annual pest of snap beans and potatoes. Damage caused ...

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  • Potato Disorders: Common Scab and Powdery Scab
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    Potato Disorders: Common Scab and Powdery Scab

    Author(s) Karen Delahaut, Walt Stevenson. Two distinctly separate diseases commonly known as scab can infect potatoes, significantly reducing tube...

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  • Onion Thrips
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    Onion Thrips

    Author(s) K. A. Delahaut. Onion thrips (Thrips tabaci) are an important annual pest of onion. They may attack nearly all garden crops, but serious...

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  • Onion Maggot
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    Onion Maggot

    Author(s) K. A. Delahaut. Onion maggots (Hylemya antiqua) are tiny maggots that feed below ground on onion bulbs, making tunnels in the bulbs and ...

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  • Onion Disorders: Botrytis Leaf Blight, Leaf Fleck, and Neck Rot
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    Onion Disorders: Botrytis Leaf Blight, Leaf Fleck, and Neck Rot

    Author(s) Karen Delahaut, Walt Stevenson. Three types of botrytis diseases affect onion crops. Botrytis leaf blight is a destructive disease cause...

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  • Onion Disorder: Soft Rot
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    Onion Disorder: Soft Rot

    Author(s) Karen Delahaut, Walt Stevenson. Bacterial decay, known as soft rot, is one of the most widespread and destructive storage diseases of on...

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  • Onion Disorder: Smut
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    Onion Disorder: Smut

    Author(s) Karen Delahaut, Walt Stevenson. Onion smut can be a serious disease of onions, leeks, and shallots. The disease is caused by the fungi U...

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  • Onion Disorder: Purple Blotch
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    Onion Disorder: Purple Blotch

    Author(s) Karen Delahaut, Walt Stevenson. Purple blotch causes onion leaves to become blighted and die prematurely. The result is reduced yields f...

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  • Onion Disorder: Fusarium Basal Rot
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    Onion Disorder: Fusarium Basal Rot

    Author(s) Karen Delahaut, Walt Stevenson. This disease, caused by the common soil fungus Fusarium oxysporum f. sp. cepae, can be found wherever on...

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  • Onion Disease: Downy Mildew
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    Onion Disease: Downy Mildew

    Author(s) Karen Delahaut, Walt Stevenson. Downy mildew is a destructive disease that can reduce yield and bulb quality of onions, garlic, leeks, s...

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  • Insect Pest Management for Greenhouses
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    Insect Pest Management for Greenhouses

    Author(s) R. Chris Williamson, Samuel Soper, P. J. Liesch. This handy chart lists pesticides that are most effective against common greenhouse pes...

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  • Hornworms
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    Hornworms

    Author(s) K. A. Delahaut. Tomato and tobacco hornworms feed on tomatoes late in the season. This fact sheet details the insects' life cycle, the d...

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  • Handbook of Pea Diseases
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    Handbook of Pea Diseases

    Author(s) D. J. Hagedorn. This guide provides essential scientific information and meaningful visual guidance regarding the most common diseases ...

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  • Cucurbit Downy Mildew: Identification and Management
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    Cucurbit Downy Mildew: Identification and Management

    Author(s) Amanda Gevens, Michelle Marks. Cucurbit downy mildew is a destructive disease of all plants in the gourd family, including cucumber, wa...

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  • Cucumber Beetles
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    Cucumber Beetles

    Author(s) K. A. Delahaut. Spotted and striped cucumber beetles damage vine crops like cucumbers, squash, watermelons, muskmelons, and pumpkins. Th...

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  • Corn Disorders: Smut and Rust
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    Corn Disorders: Smut and Rust

    Author(s) Karen Delahaut, Walt Stevenson. Common smut is caused by the fungus Ustilago maydis and is the most widespread disease of sweet corn, oc...

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  • Colorado Potato Beetle
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    Colorado Potato Beetle

    Author(s) K. A. Delahaut This publication is packed with practical information for organic and conventional growers who encounter Colorado potato ...

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