Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu Plantings for late summer and fall harvested vegetables will be underway in the next few weeks. Timing these plantings can be a challenge, especially where multiple harvests are needed. Plantings from early… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu We are currently seeing lettuce affected by bottom rots and leaf drop. There are several disease organisms in our region that can cause these diseases. Bottom Rot Bottom rot is caused by… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu High temperatures (90°F or higher) coupled with clear skies can lead to heat buildup on the surface of black plastic mulched soils. We have found temperatures of over 140°F at the surface… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu Bolting is the term used for flower stalk formation in vegetables. Bolting response may be related to temperature, daylength, or a combination. Bolting in spinach, lettuce, and some radishes (oriental types) will… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu Cauliflower, cabbage, Brussels sprouts, Chinese cabbage (Napa cabbage) and lettuce are susceptible to tipburn. This problem can cause severe economic losses. Tipburn is a breakdown of plant tissue inside the head of… Continue Reading
