Recently, I have observed several pumpkin vines and fruit with Plectosporium blight. When I receive phone calls about Plectosporium blight, the caller often has trouble describing the disease. Indeed, the disease is difficult to describe. Therefore, I will include several photos with this article. Lesions of Plectosporium blight are most often observed on the stems…Read more about Plectosporium Blight of Pumpkin[Read More]
Plant Disease Management
Southern blight of pepper and tomato thrives under hot, dry conditions. Usually, such conditions are more likely in August. Production under tunnels may contribute to the dry conditions that influences southern blight. This article will discuss the symptoms, biology and management of southern blight of tomato. Southern blight has a wide host range affecting many vegetable,…Read more about Southern Blight of Tomato and Pepper[Read More]
Recent heavy rains have caused an increase in foliar disease in many vegetable fields. A sudden increase in foliar disease may lead some growers to purchase expensive fungicides to take care of the problem. However, there are several considerations before one applies the most expensive fungicide. The optimum time to apply a very effective, and…Read more about Late Season Fungicide Applications[Read More]
Root-knot nematodes (RKN) are a devasting soilborne pest on a wide range of vegetables and fruits. Root-knot nematode infections result in root swellings called galls (Figure 1). Heavily infected crops by RKN display aboveground symptoms such as stunted growth, wilting, and leaf yellowing. We often found root-knot nematode causes damage to watermelons, cantaloupes, and tomatoes…Read more about Root-knot Nematode on Vegetable Crops[Read More]
This is the fourth article in a series that describes the three primary bacterial diseases of tomato: bacterial canker, bacterial speck and bacterial spot. This article is a general summary of management options for these diseases. All three of these diseases may be seed borne and brought into to field situation on transplants. It is…Read more about General Management Options for Bacterial Diseases of Tomato[Read More]
The following is an article in one of a series about bacterial diseases of tomato. Previously, articles about bacterial canker and bacterial spot have been featured here. The next article will be about general management methods for bacterial diseases of tomato. Bacterial speck causes lesions on all above ground portions of the tomato, in a…Read more about Bacterial Speck of Tomato[Read More]
Powdery mildew is a common disease of cucurbits in Indiana. This disease is more common on cantaloupe and pumpkin. However, we have observed powdery mildew more frequently on watermelon in recent years. We have also observed this disease on cucumber in high tunnels. If left uncontrolled, this disease can cause loss of foliage, loss of…Read more about Powdery Mildew-Biology[Read More]
The following article was written by a colleague located on Long Island in New York. She is an expert on cucurbit powdery mildew. The fungicides which are effective against cucurbit powdery mildew changes frequently as fungi become resistant to certain fungicides. While the situation Dr. McGrath describes may not match your field exactly, it makes…Read more about Conventional Fungicide Recommendations for Cucurbit Powdery Mildew[Read More]
In the Midwest, three major bacterial diseases threaten tomato production. These diseases are bacterial canker, bacterial spot and bacterial speck. Although these diseases are all caused by bacteria, they vary in symptomology, biology and management options. We will discuss symptoms, biology and management of the three bacterial diseases in a series of newsletter articles. This…Read more about Tomato Bacterial Diseases — Bacterial Canker[Read More]
In the next month, many growers will start to plant pumpkins. This article will introduce aspects of disease management of pumpkins prior to the growing season. The information below is discussed under several of the most common diseases of pumpkins in Indiana. The objective of this article is to discuss what diseases are more likely…Read more about A Brief Primer on Disease Management of Pumpkin[Read More]