Utah Pests News Spring 2012

Manage Chlorotic Pine Trees in the Spring

Many pine tree species in northern Utah are showing chlorotic (yellowing) needles this spring. Chlorosis of needles often indicates nutrient deficiency, in this case, iron and possibly nitrogen. Pine trees grow best in soils with a pH between 5 and 6, while most Utah soils have a pH of 7 or higher, preventing iron from being available for absorption. Iron chlorosis has been exacerbated by the wet soils of the past two to three springs. Saturated soils make it more difficult for pine trees to take up enough nutrients, including nitrogen. Soil application of chelated iron (in the form of EDDHMA or EDDHA), when the tree actively starts growing again in spring, can improve the symptoms. Foliar-applied iron may also be necessary. When planting new trees, the pH requirement of the tree should be considered and species should be used that are adapted to high pH.

-Claudia Nischwitz, Plant Pathologist

General News

Photo Contest on Facebook

Get connected with what’s happening with the UTAH PESTS group on Facebook at: facebook.com/utahpests! Submit your prized plant pest photograph for a chance to win a “pest monitoring” package, including a copy of Gardening with Good Bugs by Erin Hodgson, a lighted hand lens, vials and forceps for collecting specimens, and more.
When submitting your image, clearly label that it is an entry in the contest in your post. The photo that gets the most “likes” by June 1 will be announced as the winner on your own Facebook page, on the Utah Pests page and the summer issue of UTAH PESTS News.

Bumble Bee Workshop at USU

USU Extension and the USDA-ARS Bee Biology and Systematics Laboratory will be offering a bumble bee workshop in Logan on June 22. Topics to be covered will include bumble bee biology, conservation, rearing, and others. Cost is $35 and will include a light breakfast and lunch. For more information or to register, go to www.loganbeelab.usu.edu.

Featured Picture of the Quarter

Spring came early this year, as did peach bloom. Some growers were caught by surprise and had to prune during bloom, creating a carpet of pink on the orchard floor.  But winter temps didn’t exit so easily, and heavy frosts damaged peach, apricot, and sweet cherry blooms in many areas of northern Utah. The full extent of damage will not be realized until later in the season.