Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu Long time growers of cole crops know that the micronutrient boron is critical for production. However, newer growers may be unaware of these requirements. Boron is also subject to leaching with rainfall,… Continue Reading
Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu Symptoms of downy mildew include purple to yellowish- brown spots on upper leaf surfaces. A grayish-white spore mass will develop and cover the underside of leaves under ideal temperatures (night temperatures of 46 –… Continue Reading
Gordon Johnson, Extension Vegetable & Fruit Specialist; gcjohn@udel.edu Plantings for fall harvested vegetables are underway. Timing these plantings can be a challenge, especially where multiple harvests are needed. Plantings from mid-July through the end of August may be made, with… 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
Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu Downy mildew and Alternaria can be a problem in fall crops (cabbage, collards, broccoli, cauliflower, and kale). When the disease first appears, apply a fungicide every 7 to 10 days. Quadris, chlorothalonil, Cabrio, Endura… Continue Reading
