Have you ever been apprehensive to bite into an apple for fear of what you might find? The worms found in apples and pears may add protein to a diet but are typically not a supplement most people enjoy.
The most serious pest to apples and pears in northern Utah is the codling moth. The larvae or worms of the codling moth are the most notorious “protein prizes” sometimes found in the fruit. If left unchecked, these pesky critters may cause drastic fruit loss.
In northern Utah, the codling moth (Cydia pomonella) typically produces two generations. The first generation occurs in late spring when evening temperatures are around 55-60 F. Adults emerge about the time trees are in full bloom and take about three weeks to mature, mate and begin laying eggs. The second-generation moths will not begin to emerge until around the first of July, with peak activity in mid-July through early August. Consider these tips for control.
• Because control of the codling moth is focused on the newly hatching eggs and larvae, timing is critical. Spraying too early is ineffective and a waste of money. Spraying too late will reduce the effectiveness of control. Control of the first generation of codling moth is crucial in managing the pest.
• Traditionally, the first cover spray to control codling moth has been applied about 10 days after petal fall. However, because these insects are cold-blooded and develop according to warm temperatures, each year’s onslaught can and most likely will vary. The first application should be applied between late May and early June, depending on location, and should continue through about mid-July. Re-application timings vary according to the product used.
• Common chemicals available to help homeowners control codling moth are Spinosad, Carbaryl, Permethrin and Malathion. When using these products, be certain to read and follow label instructions.
• Through trapping of fruit tree pests along with disease monitoring, Utah State University has developed a Web site that is updated weekly with information on codling moth spray times and fruit tree pests. Visit http://extension.usu.edu/ipm for information. You can also contact your local USU Extension office to determine a specific spray time in your area. For additional information on the codling moth, check the USU Fact sheet at http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1879&context=extension_curall.
By: JayDee Gunnell - Jun. 6, 2009