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Kim Lewers, USDA-Agricultural Research Service Beltsville, Maryland

Kim Lewers, USDA-Agricultural Research Service Beltsville, Maryland. Plugs are made from end of June to 4 July. Plugs are planted in the field the first half of August. The field is fertigated with ~12lbs/A of nitrogen after one

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Kim Lewers, USDA-Agricultural Research Service Beltsville, Maryland

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  1. Kim Lewers, USDA-Agricultural Research Service Beltsville, Maryland

  2. Plugs are made from end of June to 4 July. • Plugs are planted in the field the first half of August. • The field is fertigated with ~12lbs/A of nitrogen after one • week, every week to 3rd week of September, to a total of ~75 lbs/A. • The beds are covered with straw mid-December to mid- • March.

  3. Frost protection is a combination of misters at 34F and Rainbirds at 32.1F. • The field is fertigated with ~5lbs/A of nitrogen per week in April, to between 20-30 lbs/A. • Plots are harvested twice weekly from mid-May through mid-June. • Rotation is ‘Essex’ rape - strawberry – corn or sudex – soybeans, with rye-vetch winter covers.

  4. Influence of Nitrogen, Phosphorus, and Potassium on the Severity of Strawberry Anthracnose Crown Rot • B.J. Smith • United States Department of Agriculture, Agricultural Research Service • Southern Horticultural Laboratory, Small Fruit Research Unit • Poplarville, MS 39470 • USA • Seven (7) nitrogen sources at three (3) rates: • Higher N rates led to more anthracnose. • Among plants getting higher N rates, those treated with • Ca(NO3)2were the most disease tolerant. • Plants treated with nitrate nitrogen sources, including • NH4NO3, had less severe anthracnose symptoms than • plants receiving nitrogen from other ammonium sources. • Take-home: Nitrate forms mean less anthracnose than ammonium forms.

  5. ‘Earliglow’

  6. ‘Allstar’

  7. ‘Ovation’

  8. B1033

  9. Hand-outs to take home… Field rot % is calculated by harvesting the good fruit and rotten fruit into two buckets and weighing them separately. Post-harvest rot % is calculated from the number of total berries that are rotted after two weeks at storage in clamshells at 41F. The average berry size for each harvest was recorded. “Average berry size” is the average of all those averages. “Large berry size” is the largest of those averages.

  10. USDA-ARS Beltsville strawberry breeding yield gain

  11. John Enns George Meyers Thank you! Want to visit? Kim.Lewers@ ARS.USDA.gov Office: 301-504-6768 Cell: 240-463-5654

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