Latest WSU Extension guides: Why do leaves turn red? Mosquitoes, bug off from my orchard!

Mosquito stock photo

The latest free guide from scientists at Washington State University can help orchardists eliminate disease-carrying mosquitoes. Revised publications examine why leaves turn red, and update grape growers on the best ways to control pests, diseases, and weeds.

Managing Mosquitoes in Washington Irrigated Orchards (FS386E)

West Nile virus infects nearly 15% of mosquitoes in parts of Washington, and the insects and the viruses they carry can concentrate in irrigated areas. Effective mosquito control is increasingly important in irrigated orchards for keeping workers and animals safe. This publication offers options for growers to get a handle on pesky mosquito populations. Authors include Daniel Marshall and Laura Flandermeyer, both graduate research assistants in the Department of Entomology, and Dowen Jocson, a pesticide safety educator with WSU’s Pesticide Resources and Education Program.

Autumn coloration in the Corylus plant
Autumn coloration in the Corylus plant- from the Extension guide.

Revised guides

Why do Leaves Turn Red? – Home Garden Series (FS209E)

Spectacular autumnal displays include the crimsons and yellows of changing leaves. But when does the red color associated with fall indicate an actual problem in the garden? Learn how to identify the unusual stressors that can also cause leaf reddening, in this guide written by Linda Chalker-Scott, professor and Extension specialist in the WSU Department of Horticulture.

Composite image- grape pest and disease control
Images from the cover of the current Pest Management Guide for Grapes in Washington (EB0762)

Pest Management Guide for Grapes in Washington (EB0762)

This annually revised guide covers controls for diseases, insects, weeds, and vertebrate pests in Washington vineyards, including various chemicals and their uses. Disease and insect controls are coordinated to pest and crop stages, while weed controls are outlined for new and established plantings. Contributors are WSU and USDA scientists, including Gwen Hoheisel, Michelle Moyer, Rachel Bomberger, Wendy Sue Wheeler, Rui Liu, David James, Douglas Walsh, Inga Zasada, Naidu Rayapati, Prashant Swamy, Stephen Onayemi, and Bernadette Gagnier.

Find more new and revised guides from 2024 at Extension Publications’ Online Bookstore Updates website.