Thomas F. Cummings

Cost of Fungicides Used to Manage Potato Late Blight in the Columbia Basin: 1996 to 1998

The cost of managing potato late blight with fungicides in the Columbia Basin of Washington and Oregon in 1996 to 1998 was documented and compared with the cost of managing the epidemic in 1995. Mean number of fungicide applications on late-season potatoes from 1996 to 1998 ranged from 5.3 to 8.8 in the north Columbia Basin of Washington and 8.5 to 12.3 in the southern basin of Washington and Oregon. Mean cost per hectare of fungicides and application on late-season potatoes in 1998 was

Incidence of Colletotrichum coccodes in certified potato seed tubers planted in Washington State

316 per hectare (

Latent Infection of Potato Seed Tubers by Phytophthora infestans During Long-Term Cold Storage

128 per acre) in Washingtons north basin and

Effect of Chemical Defoliation, Irrigation Water, and Distance From the Pivot on Late Blight Tuber Rot in Center-Pivot Irrigated Potatoes in the Columbia Basin

472 per hectare (

UAS imaging-based decision tools for arid winter wheat and irrigated potato production management

191 per acre) in Washingtons south basin. Even though the price of most fungicides had increased since 1995, total cost of control per hectare over the season was less during 1996 to 1998 than in 1995 because of altered management practices. These included fewer fungicide applications, a shift toward lower cost fungicides, substitution of aerial application by chemigation, and a reduction in the number of fields chemically desiccated before harvest. Total cost of managing late blight and tuber rot loss was

Impact of Seed Lot Infection on the Development of Black Dot and Verticillium Wilt of Potato in Washington

22.3 million in 1998, whereas it was

Effect of Extended Crop Rotations on Incidence of Black Dot, Silver Scurf, and Verticillium Wilt of Potato

30 million in 1995. The 1998 cost included

Association of Solar Irradiance and Days of Precipitation with Incidence of Potato Late Blight in the Semiarid Environment of the Columbia Basin

19.8 million for fungicide applications and materials,

Effect of Powdery Scab Root Galls on Yield of Potato

1.1 million for canopy desiccation, and

Fungicide application for late blight management: a boom attached to a center pivot irrigation system

1.4 million loss due to tuber rot in storage.