Shoot Thinning The optimum shoot density is 5-6 shoots per foot of row. Thinning to this density can help reduce shading, adjust the crop, lower the risk of disease and improve spray penetration. The optimal time for shoot thinning is before the shoots reach 12 inches. Much of the state is past this point, so[Read More…]
Miranda Purcell
Shoots are at various stages of development across the state with some shoots at or near bloom. The most important time of the year for fruit disease control is from pre-bloom to 4-5 weeks past fruit set. The potential for fruit infection drops significantly 4-5 weeks post-bloom. Important diseases to control during this time include[Read More…]
Grapevines are in early stages of growth across the state. Significant shoot growth is expected with the warm weather predicted for this week. Disease Control This is a very important time to maintain preventative control over major grape diseases including Phomopsis, black rot, powdery mildew and downy mildew. Fungicide application should begin at 1-3 in[Read More…]
Grapevines are in various stages of early growth throughout Indiana, ranging from bud swell to 6-8 in shoot growth, depending on variety. A cold weather event came across the state on 4/24 bringing temperatures as low as 25°F (see Figure 1). The minimum temperatures in the following areas were reported as follows: Lafayette, IN: 28.9°F[Read More…]
Extreme cold temperatures were experienced across the state on December 23-24th 2022 (Figure 1). Temperatures ranged from -10- -5° F across most of the state with temperatures dipping below -10°F in some areas. Since then, there have been some additional cold events, such as 7° F on January 31-February 1 and 12° F on March[Read More…]
Dr. Janna Beckerman, Professor and Extension Plant Pathologist in the Dept. of Botany and Plant Pathology joined our discussion to talk about Spring Diseases and Management. Our discussion focused on Anthracnose fruit rot and Botrytis fruit rot. Janna described the biology of the pathogens and provided cultural and fungicide recommendations for managing these diseases. You[Read More…]
A Spotted Lanternfly (SLF) population was found in Huntington, Indiana. This is the second population in the state in addition to what was found in Vevay, Indiana in July 2021. It is possible for SLF to be anywhere in Indiana. At this time of year, the insects are at their most recognizable stage as colorful[Read More…]
Tissue analysis is the most reliable means of determining plant nutritional status. Combined with soil testing, tissue analysis can help pinpoint the source of problems and determine what measures may be needed to ensure proper nutrition of the crop. Tissue analysis samples should be collected at the appropriate time to give the most meaningful results.[Read More…]
Now is the time to start thinking about leaf removal in grapevines. Cluster zone leaf removal can lower risk of disease, increase spray penetration and even improve fruit quality. The period immediately after bloom to 3 weeks post-bloom is the most effective time for leaf removal. Leaf pulling after this time can increase the risk[Read More…]
Pesticide Drift Grapes are particularly sensitive to growth regulator herbicides, such as 2,4-D and dicamba, which are widely used in corn and soybean production. These products can injure the vines, significantly reduce yields and contaminate the fruit even at extremely low rates. The most common symptoms of pesticide exposure include distortion of leaves and stunting[Read More…]