Disease Management

Leaf Blight on a corn leaf.

Featuring corn, soybeans and small grains, Delaware's commercial field crops are an important local industry.

Disease Management

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Disease Management | Cooperative Extension | University of Delaware
Disease Management | Cooperative Extension | University of Delaware
Disease Management | Cooperative Extension | University of Delaware

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  • ALFALFA WEEVIL CONTROL IN ALFALFA

    The alfalfa weevil (AW) overwinters in both the adult and egg stages. Although egg laying occurs in the fall and spring, larvae hatching from spring-laid eggs cause the most damage. Eggs are laid in the alfalfa stem any time temperatures are above 48 degrees F.

  • ALFALFA WEEVIL CONTROL IN ALFALFA (Section 2)

    The alfalfa weevil (AW) overwinters in both the adult and egg stages. Although egg laying occurs in the fall and spring, larvae hatching from spring-laid eggs cause the most damage.

  • APHID CONTROL IN SMALL GRAINS IN THE SPRING

    The most common aphid species found in Delaware small grain fields are the English grain aphid, bird cherry-oat aphid, corn leaf aphid, and the greenbug. These four species can overwinter on small grains as eggs or as females which give rise to offspring in the spring. 

  • BAGWORMS (LEPIDOPTERA: PSYCHIDAE)

    Bagworms feed on a variety of deciduous and evergreen plants including arborvitae, juniper, spruce, pine, maples, sycamores and numerous others. Evergreen trees and shrubs cannot recover from complete defoliation; whereas deciduous trees usually develop new leaves following defoliation.

  • CEREAL LEAF BEETLE CONTROL IN SMALL GRAINS

    Cereal Leaf Beetle: Overwintering adults emerge in mid-March and begin to lay eggs after 2 to 3 weeks of feeding. Since females prefer to lay eggs on young plants, spring-planted oats and late-planted wheat are the predominant hosts. 

  • CEREAL RUST MITE IN TIMOTHY

    Cereal rust mite adults are small measuring less than one millimeter (mm), and for the first time observer a 10-20X hand lens is needed to see them.

  • DECTES STEM BORER MANAGEMENT IN SOYBEANS

    The Dectes stem borer (DSB) is a longhorn beetle that is native to North America, and feeds on many wild and some cultivated plant species. 

  • DIAGNOSING HORTICULTURAL PLANT PROBLEMS

    Diagnosing horticultural plant problems is similar to being a detective. The investigator must collect and evaluate all clues, keep good notes, establish the facts, and synthesize them into a conclusion. Take adequate representative samples and keep collected samples in good condition. Have an open mind and don't assume that the current problem is the same as another similar one.

  • GRASS SAWFLY AND TRUE ARMYWORM MANAGEMENT IN SMALL GRAINS

    Grass Sawfly - Adult sawflies emerge in early April, mate and begin to lay eggs in the leaf margins of small grains. Most egg laying is complete by early May.

  • HOW TO SCOUT AND TROUBLESHOOT PROBLEMS IN CROPS

    Gather tools that will help you acquire a sample, cutters, small shovel, hand lens, plastic bags, marker, etc. Go to the field with an open mind and investigate all possibilities!

  • INSECTICIDES FOR APHID CONTROL ON VEGETABLES

    Insecticide efficacy rankings based on consensus of Northeast, Mid-Atlantic, and Southern entomologists.

  • KISSING BUGS

    Kissing bugs are insects that feed on blood from animals and people. They are native to Delaware and live in wooded areas.

  • NON-CHEMICAL PEST CONTROL OPTIONS FOR MANAGING INSECT PESTS ON BEANS

    July and August in the vegetable garden typically bring bountiful harvests of colorful vegetables. These are also the months when insect pests can really make their presence known, with plant and fruit damage becoming increasingly noticeable. 

  • NON-CHEMICAL PEST CONTROL OPTIONS FOR MANAGING INSECT PESTS ON BRASSICAS

    July and August in the vegetable garden typically bring bountiful harvests of colorful vegetables. These are also the months when insect pests can really make their presence known, with plant and fruit damage becoming increasingly noticeable. 

  • NON-CHEMICAL PEST CONTROL OPTIONS FOR MANAGING INSECT PESTS ON CUCURBITS

    July and August in the vegetable garden typically bring bountiful harvests of colorful vegetables. These are also the months when insect pests can really make their presence known, with plant and fruit damage becoming increasingly noticeable. 

  • NON-CHEMICAL PEST CONTROL OPTIONS FOR MANAGING INSECT PESTS ON SOLANACEOUS PLANTS

    July and August in the vegetable garden typically bring bountiful harvests of colorful vegetables. These are also the months when insect pests can really make their presence known, with plant and fruit damage becoming increasingly noticeable. 

  • SOYBEAN CYST NEMATODE

    The soybean cyst nematode (Heterodera glycines) is the most significant nematode pest affecting soybeans on Delmarva and in the United States. First detected in Delaware in the fall of 1979, the soybean cyst nematode (SCN) was widespread in Sussex County. Although found in Kent County just a few years later, SCN was not discovered until 1991 in New Castle County in the southwest corner near Clayton. 

  • SOYBEAN CYST NEMATODE (Part 2)

    Soybean Cyst Nematode (SCN) is the most yield limiting pathogen of soybeans across the US. Often referred to as a “silent yield robber”, SCN may be present and reducing yield without notable aboveground symptoms

  • Soil Insect Management in Field Corn

    Five major soil insects can be found in corn fields: seed corn maggot, white grubs, wireworms, cutworms and rootworms. Corn rootworm populations have increased in continuous corn production areas of New Castle and northern Kent counties. 

  • Spiders and Why You Want Them Around

    Common Name: Grass Spider

    Scientific Name: Agelenopsis

    Characteristics:

    • Cave-like web

    • Fast speed

    • Yellowish-brown color.

  • TWO SPOTTED SPIDER MITE

    The twospotted spider mite (TSSM) is a plant-feeding mite that is an extremely widespread pest affecting nearly all crop plants (over 1000 plant species). TSSM is very small in size and requires magnification to see clearly. 

  • WINTER GRAIN MITE MANAGEMENT IN SMALL GRAINS

    The winter grain mite (WGM), as its name implies, is a cool season pest of small grains and orchard grass. 

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Disease Management | Cooperative Extension | University of Delaware

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Disease Management | Cooperative Extension | University of Delaware
Disease Management | Cooperative Extension | University of Delaware
Disease Management | Cooperative Extension | University of Delaware
Disease Management | Cooperative Extension | University of Delaware