Recent reports bring to mind that warm and wet spring weather is perfect for development of the bacterial disease known as fireblight in susceptible hosts. Fireblight is caused by Erwinia amylovora, a bacterium that only affects plants in the rose family (Rosaceae). Some common hosts include apple, crabapple, cotoneaster, hawthorn, mountain ash, pyracantha, and pear.
Continue reading...May 28, 2013 Joe Ingerson-Mahar
Pepper Weevil Alert #2
There are now 6 non-farm locations where adult pepper weevils are being trapped. Traps at 3 farm sites have also caught weevils in the past week, including 2 pepper fields. Large numbers of weevils are being trapped at one of these non-farm sites, 54 in a 4 day period. It is not clear if this […]
Continue reading...May 28, 2013 A.Wyenandt, W.Kline, and J.Ingerson-Mahar
Tomato Disease Forecasting Report 5-28-13
5-28-13 Tomato Report – Click to Download Disease severity values (DSVs) for early blight, septoria leaf spot, and tomato anthracnose development are determined daily based on leaf wetness (due to rainfall, dew) and air temperature. On a daily basis DSV values can range from 0 to 4 where 0 = no chance for disease development […]
Continue reading...May 28, 2013 A.Wyenandt, W.Kline, and J.Ingerson-Mahar
Potato Disease Forecasting Report 5-28-13
Potato Disease Forecasting Report 5-28-13 – Click to Download We will be tracking DSVs for Late blight development and calculating P-days for initiating the first early blight fungicide application. The first late blight fungicide application is recommended once 18 DSVs accumulate from green row. Green row typically occurs around the first week in May in southern […]
Continue reading...May 24, 2013 Administrator
Red Thread Disease is Active
By Jim Murphy Several weeks ago the cool wet weather brought on some red thread disease activity that has increased over the past 4 to 5 days. Turfs under low maintenance, particularly low nitrogen fertility, have been the areas with the greatest amount of red thread. This disease has been active on on slender and strong […]
Continue reading...May 24, 2013 Mark VanGessel
Postemergence Sprays for Corn Fields with Palmer Amaranth
Mark VanGessel, Extension Weed Specialist; mjv@udel.edu I have seen Palmer amaranth seedlings emerging in corn fields that had no preemergence herbicides applied. There are Palmer amaranth plants in DE and MD that are resistant to glyphosate. So fields with Palmer amaranth present, or fields where you suspect it is present, need to be treated with an […]
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