Response Of Crisphead Lettuce To Rates Of Nitrogen And Potassium (1988)

Introduction

The Effect of Floating Row Covers on Virus Transmission and Yield of Potato Seed Stock (1990)

Research report from OSU's North Willamette Research and Extension Center

Delbert Hemphill and Gary Reed
Oregon State University

Introduction

Control of virus-vectoring aphids is essential in potato seed production to exclude viruses such as potato virus Y (PVY) and leaf roll. Floating row covers might protect plants from insect attack, reducing the need for insecticides.

Effect of Nitrogen Sources and Rates and Supplemental Calcium on Broccoli Yield and Head Rot (1990)

Introduction

Beet Western Yellows Virus Survey (1990)

Research report from OSU's North Willamette Agricultural Research and Extension Center

Delbert Hemphill
OSU Dept of Horticulture, NWREC

Introduction

Screening Lettuce and Spinach Germplasm for Resistance to Beet Western Yellows Virus (1992)

Introduction

Beet western yellows virus (BWYV), an aphid-vectored luteovirus, causes a pronounced, bright yellow color to the leaf margin of lettuce, spinach, and other leafy greens. Interveinal chlorosis may also develop. The virus does not usually stunt growth and is not considered a problem in many susceptible crops. However, where the leaves are harvested or comprise the edible portion of the crop, such as with lettuce, spinach, Chinese cabbage, and root crops sold with the shoots attached, even a slight expression of symptoms can render the crop unmarketable.

Effect of Frequency and Timing of Irrigation on Yield and Head Rot of Broccoli (1994)

Introduction

Using Cover Crops to Control Mold in Snapbeans (1998)

Research report from OSU's North Willamette Research and Extension Center

Delbert Hemphill
OSU Dept of Horticulture

Mary Powelson
OSU Dept of Botany and Plant Pathology

Introduction

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