Seed-Transmitted Wheat Mosaic Virus in Sweet Corn in Utah

Wheat mosaic virus (WMoV) (syn. High Plains virus) was first observed in corn in 1993 in Colorado, Idaho, Kansas, and Texas (Seifers et al. 1997). The virus causes chlorotic streaks and mosaic on corn foliage, and it stunts ear development. When infected early in the season, plants frequently die. There are anecdotal reports of reduced seed germination rates in infected seed lots. The host range of the virus includes corn, small grains, and yellow and green foxtail. The virus is transmitted by the wheat curl mite (Aceria tosichella Keifer 1969). Seed transmission of WMoV at extremely low rates was demonstrated in sweet corn in greenhouse grow-out tests by Forster et al. (2001), but due to the low transmission rate of three seedlings out of \u3e38,000 tested, this mode of transmission was considered to be negligible

Downy Mildew of Alfalfa

This fact sheet describes downy mildew, an obligate parasite. It describes symptoms in alfalfa, the disease cycle and how to manage it

Big Bud Disease in Tomatoes and Peppers

This fact sheet provides information on the symptoms of big bud on tomatoes and peppers. It reviews the disease cycle and recommendations on controlling beet leafhopper and managing big bud disease in Utah

Importance of seed as an inoculum source for High Plains Virus in sweet corn

High Plains Virus (HPV) is found in small grains and corn and is commonly transmitted by the wheat curl mite. In 2016, a local farmer had a high incidence of HPV in all of his sweet corn in three different locations. However no mites were found. Drone imagery was taken of the field and showed a pattern of infected corn plants that indicated that the virus was seed borne. Yield loss was an estimated 50% for the field. Seed transmission of HPV in corn has been considered unimportant in the past due to low percentage of infection (Forster et al. 2001). The objective of this project was to determine the level of seed contamination with HPV and rate of seed transmission to corn plants

Fire Blight of Pears and Apples

This fact sheet describes fire blight, a bacterial disease of concern to apple and pear growers, and how it can be managed

Fuego bacteriano del manzano y el peral (Erwinia amylovora)

This publication includes information on Erwinia Amylovora

Powdery Mildews on Vegetables

Powdery mildew is one of the most easily recognized fungal plant diseases. It is categorized by spots or patches of white-to-gray powder-like growth on foliage, stems, or fruit. Roughly 700 species exist that infect grasses, ornamentals, weeds, fruit trees, landscape trees, shrubs, and vegetables. The closely related species of fungi that cause powdery mildew are host-specific, meaning they cannot survive without the proper host. Powdery mildew fungi spread in conditions of low rainfall and hot temperatures, making Utah’s climate the perfect environment. This fact sheet provides information on powdery mildew and its management