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Diseases- Weeds- Insects & Other Problems-C102

  • 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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  • Cole Crops Disorder: Clubroot
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    Cole Crops Disorder: Clubroot

    Author(s) Karen Delahaut, Walt Stevenson. Clubroot is an old and serious disease of cole crops, including Brussels sprouts, cabbage, Chinese cabba...

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  • Cole Crops Disorder: Blackleg
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    Cole Crops Disorder: Blackleg

    Author(s) Karen Delahaut, Walt Stevenson. Once a very destructive disease, blackleg of cole crops has become less important with the introduction ...

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  • Cole Crops Disorder: Black Rot
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    Cole Crops Disorder: Black Rot

    Author(s) Karen Delahaut, Walt Stevenson. Black rot is one of the most serious diseases of cole crops. Learn about black rot's life cycle, how it ...

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  • Caterpillar Pests of Cole Crops
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    Caterpillar Pests of Cole Crops

    Author(s) Karen A. Delahaut. This fact sheet covers the imported cabbageworm, the cabbage looper, and the diamondback moth. Scouting tips and effe...

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  • Carrot Diseases: Alternaria and Cercospora Leaf Blights
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    Carrot Diseases: Alternaria and Cercospora Leaf Blights

    Author(s) Karen Delahaut, Walt Stevenson. Alternaria and Cercospora leaf blights are common fungal diseases of carrot leaves and petioles. Learn a...

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  • Cabbage Maggot
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    Cabbage Maggot

    Author(s) K. A. Delahaut. Cabbage maggots are insects that damage cole crops by feeding on the plant's roots and lower stems. Wounds produced by t...

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  • Black Cutworm
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    Black Cutworm

    Author(s) Karen Delahaut. Black cutworm larvae are active nighttime feeders, clipping many seedlings at or below the soil line. They prefer beets,...

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  • Beet Disorder: Cercospora Leaf Spot
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    Beet Disorder: Cercospora Leaf Spot

    Author(s) Karen Delahaut, Walt Stevenson. Cercospora leaf spot is the most prevalent and devastating disease of the table beet in Wisconsin. This ...

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  • Assessing the Decay Potential of Potato Crops
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    Assessing the Decay Potential of Potato Crops

    Author(s) Zahi K. Atallah, Walter R. Stevenson. Potato tubers may become infected in the field but show no symptoms for days, or even weeks, after...

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  • Asparagus Beetle
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    Asparagus Beetle

    Author(s) K. A. Delahaut. The common and spotted asparagus beetle are common pests in Wisconsin. This fact sheet details the insects' life cycle, ...

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  • Analysis of the Snap Bean Root Rot Potential of Wisconsin Fields
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    Analysis of the Snap Bean Root Rot Potential of Wisconsin Fields

    Author(s) K. M. Kobriger, D. J. Hagedorn, W. R. Stevenson.  Bean root rot is one of the most destructive diseases of commercially grown snap beans...

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