By Jeff Pacheco, Technical Sales Agronomist, DuPont Crop Protection
Q: What is the outlook for navel orangeworm pressures this season and what is the best treatment strategy for late-season control in almonds?
A: All indicators point to the potential for heavy pressure from navel orangeworm (NOW) this season. That means growers should plan now for a season-long control program. Heavy NOW last season and a mild winter with few significant storms allowed more mummies to remain on trees or survive on the ground. That, combined with this year’s early, warm spring, is setting up the possibility of heavy late-season pressure from the pest. Losing just two to three percent of an almond crop to NOW damage can equate to hundreds of dollars per acre of lost income or two to three cents per pound.
Knowing this, growers should make sure they develop a control plan that uses multiple applications and insecticides with alternate modes of action. DuPont™ Altacor® insect control is a Group 28 insecticide that provides long residual control and ovicidal1, ovi-larvicidal, larvicidal and adult activity2,3 on NOW. It is an important part of an effective control program. For resistance management purposes, avoid treating successive NOW generations with the same insecticide or insecticides with the same group number.
Growers should be prepared to make multiple applications of insecticides if heavy pressure persists through the hull split period and due to nonpareil and pollenizer variety differences in hull split timing.
The cost of an additional insecticide application in the late season is typically a fraction of a penny per pound. So with today’s almond values often topping $3 per pound, it pays to manage NOW populations and protect your crop through harvest.
1Significant ovicidal activity is observed at varying levels depending on pest species. Activity is maximized when eggs are laid onto treated surfaces.
2Disruption of adult insect behaviors in some pest species (e.g. Codling Moth, Oriental Fruit Moth) such as mate finding, mating, oviposition, feeding, locomotion and orientation.
3Adult mortality is species, application rate, exposure level, and time dependent for NOW (based on lab and field studies).
Always read and follow all label directions and precautions for use when using any pesticide alone or in tank-mix combinations. The DuPont Oval Logo, DuPont™ The miracles of science™ Altacor® and Rynaxypyr® are trademarks or registered trademarks of DuPont or its affiliates.