by Amanda Powell, Bader Rutter & Associates
Posted: Thursday, April 22, 2010 at 11:06AM EDT
INDIANAPOLIS — April 22, 2010 — Integrated Pest Management (IPM) is an increasingly critical component of managing insects in citrus production. An effective IPM program recommended by Dow AgroSciences includes a rotational spray schedule featuring DELEGATE® WG, INTREPID® 2F and LORSBAN® Advanced insecticides. If applied appropriately, these products combine to offer excellent control of Asian citrus psyllid (ACP) and citrus leafminer (CLM) while maintaining most populations of beneficials.
“Good growers are always trying to conserve beneficials, because natural enemies play a major role in the control of ACP and other pests,” says Dr. Philip Stansly, an entomologist at the University of Florida Institute of Food and Agricultural Services. “A sound IPM program should consist of monitoring pest populations and applying an appropriate amount of the right insecticide at the proper time. By doing so, growers can help reduce the impact on beneficials, while still targeting harmful pests.”
Tony Weiss, field scientist for Dow AgroSciences, says growers should consider mite and CLM pressure when developing a spray program. The amount of mite pressure in a grove can necessitate slight changes in a spray program.
“When there’s high pressure of both mites and CLM, it’s important to use products that control both pests,” Weiss says. The following recommended programs differ slightly based on insect pressure.
Low Summer Mite Pressure
In locations with low summer mite pressure, the recommended timing for applications of DELEGATE is mid-April and mid-June. DELEGATE, a Group 5 insecticide that recently received supplemental labeling for low-volume applications in Florida, offers control of both ACP and CLM.
“There is no other product on the market that is as effective as DELEGATE against both ACP and CLM,” Weiss says. “The biggest benefit of using DELEGATE — besides the efficacy it offers — is that it maintains populations of most beneficials while not flaring mites. That’s an extremely important characteristic in an effective IPM program.”
ACP is one of the most devastating pests for citrus growers because it is a direct vector for citrus greening. Low-volume applications of DELEGATE® WG insecticide will reduce populations of ACP at a substantially lower cost and allow growers to cover more acres in a shorter amount of time.
“DELEGATE is my top choice as far as what I would call a selective chemistry,” Stansly says. “No chemistry is totally selective, but it certainly is more selective than the broad-spectrum insecticides that are available. I like DELEGATE anytime from post bloom through early summer.”
Another tool in the fight against CLM is INTREPID 2F — a Group 18 insecticide — which should be applied in mid-October. INTREPID 2F received supplemental labeling for the control of CLM in Florida earlier this year.
Citrus canker enters a fruit through openings created by CLM, which makes controlling the pest an increasingly important part of production. Citrus canker makes fruit unsuitable for sale and can result in yield reductions of up to 10 percent — and monetary losses in the millions.
“INTREPID 2F is an excellent product to use on CLM while maintaining most beneficial insects,” Weiss says. “Growers should use INTREPID 2F when it best fits their spray program for CLM.”
LORSBAN Advanced is a Group 1B insecticide that controls a wide range of pests, such as ACP, mealybug and grasshopper. This product can be incorporated into spray programs when growers need to control ACP or a broad range of pests, including sprays during the winter months.
High Summer Mite Pressure
There are slight alterations in the recommended IPM program in locations with high summer mite pressure. DELEGATE should only be applied in mid-April, while INTREPID® 2F insecticide should be applied in both early September and mid-October. LORSBAN Advanced should continue to be applied in mid-December.
“Both of these programs give growers a guide as to where these insecticides fit in a spray program,” Weiss says. “There are other programs that may include a combination of these products, which could be required to meet the changing pest dynamics in the citrus grove. When mixing these products with other chemistries and additives, growers should begin with a small amount of acreage to ensure the efficacy and safety of the tank mix.”
Insecticide Resistance Management (IRM) is another crucial element in an effective IPM program. Producers run the risk of pests developing resistance if they aren’t rotating different classes of chemistries. Properly following the recommended use and application rates also will help preserve the capabilities of pest management products.
“Tools that growers are depending on will no longer be effective if they are not properly rotated,” Stansly says. “IRM is a very important aspect of an IPM program, especially for the management of ACP.”
“The varying classes of chemistries make a program featuring DELEGATE, INTREPID 2F and LORSBAN Advanced a valuable one,” Weiss says. “All three products are very effective against the pests they target and, when applied at the appropriate times, will help maintain populations of most beneficials.”
Growers should always read and follow label directions, and consult the label before purchase to determine the class of insecticides. Visit www.DelegateInsecticide.com, www.Intrepid2F.com and www.LorsbanAdvancedInsecticide.com for more information.
Source: Dow AgroSciences, LLC