Jerry Brust, IPM Vegetable Specialist, University of Maryland; jbrust@umd.edu This week I saw several high tunnel tomatoes and cucumbers with moderate to severe two spotted spider mite (TSSM) Tetranychus urticae infestations (Fig. 1). These pests vary in color from white… Continue Reading
Kate Everts, Vegetable Pathologist, University of Maryland; keverts@umd.edu A common bacterial disease of cucurbits is angular leaf spot, caused by Pseudomonas syringae pv. lachrymans. Angular leaf spot can be seed borne and its hosts include cucumber, zucchini, yellow squash, pumpkin… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu We are starting to see evidence of air pollution damage from ozone in sensitive vegetable plants. Those vegetables most susceptible include potatoes, watermelons, cantaloupes, snap beans, pumpkins, and squash. Damage is most… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu We are starting to see the oldest leaves (crown leaves) in watermelons, cantaloupes, squash, cucumbers, and pumpkins with large areas that are discolored (white, tan, or bronze). These leaves will be brittle… Continue Reading
David Owens, Extension Entomologist; owensd@udel.edu Watermelon Spider mite populations continue to build up near the edges of fields. In general, very few are in the main crop, but there are some exceptions. Last year and this year, pokeweed along wooded… Continue Reading
