New products for disease
and nematode management
With the active ingredient Iprodione, Enclosure offers producers a dual-purpose product. It provides suppression of root-knot nematode and also control against the soilborne diseases peg and pod rot and Sclerotinia blight.
In trials conducted by DevGen, researchers have demonstrated that the use of Enclosure reduces nematode damage and increases peanut quality and yield.
Enclosure is available as a flowable product.
Elast, which became available last season, offers leaf spot control and an opportunity to change the mode of action for a fungicide, an important step in preventing resistance.
Elast is a viable protectant, which means that it has to be on the foliage before the disease occurs in order to protect it.
It is a unique chemistry in the peanut market, and rotating chemistries is a good practice. Recommendations are to use 15 ounces as a stand alone leaf spot control measure or 12.8 ounces if tankmixing with another fungicide such as Folicur.
According to Aceto, the makers of Elast, it can be used alone as an economical alternative for chlorothalonil in sprays one, two and seven or in a tankmix with white mold products in sprays three through six.
Elast is a viable option for growers looking to change leaf spot chemistries at some point in the season.
EchoEminent Fungicide Co-Pack
Eminent is a systemic fungicide recently labeled for use on peanuts that delivers both preventive and curative control. Eminent is highly respected for its rapid uptake, translocation and translaminar movement. The translaminar activity rapidly transports the applied fungicide from foliage to internal tissue, where it creates an active ingredient reservoir for extended residual and new growth protection.
For 2010, Eminent is available from SipcamAdvan as a co-pack with Echo fungicide. The convenient co-pack combines a standard use ratio of five quarts Echo chlorothalonil fungicide and 2.25 quarts Eminent tetraconazole fungicide to treat 10 acres. An EchoEminent tankmix delivers a double threat to early leaf spot, late leaf spot, web blotch and rust in peanut production.
Long recognized as a standard for peanut disease control, Echo is a contact fungicide with a multi-site mode of action. It prevents peanut diseases by interrupting the metabolic activity of the fungal pathogens. Echo exhibits very low water solubility, which allows natural adhesion to the plant surface even when subject to rain or irrigation. No surfactants are required. With Echo, resistance has never been an issue.
Additional EchoEminent benefits include extended residual activity, new growth protection, enhanced leaf spot control, reduced resistance issues, simplified loading and mixing and maximized yield potential.
NemOut Biological Nematicide
The biocontrol agent, NemOut, is a formulation of spores of the fungus, Paecilomyces lilacinus, and this product has shown a moderate level of nematode suppression in University of Florida trials. It should only be used in conjunction with other recommended nematode management practices including good crop rotation and weed control.
NemOut contains live spores so the product should be handled carefully to help maintain its viability, including keeping it away from high heat conditions. For best activity of the product, NemOut should be used both in-furrow and as an at-pegging treatment.
Key points to consider when using the product are that it is a non-restricted use pesticide that has no posting or pre-harvest use limitations; it should be applied in a minimum of 20 gallons of water per acre in moist soil or prior to a rain or followed by an irrigation; it should not be mixed with any other materials at application.
For extended storage before use, the product should be maintained in a cool environment of 70 degrees Fahrenheit or kept under refrigeration until it is used. It is a wettable powder so it is important to follow label mixing instructions. PG
Fungicide And Nematicide Notes for 2010
1. Generic tebuconazole products, the active ingredient in Folicur, were popular in 2009, enhanced by the lower cost of application versus other products. In 2010, note the following about tebuconazole:
• Cost will keep this fungicide popular.
• It continues to be effective for management of soil- borne diseases.
• For control of leaf spot diseases, tankmix with another fungicide.
• Overuse without regard to fungicide resistance man- agement will lead to a decline in efficacy.
• It is not the best fungicide available for management of important diseases.
• Weigh the cost against the value of enhanced disease control with other fungicides.
2. Proline (prothioconazole), applied in-furrow, was an effective management tool for Cylindrocladium black rot (CBR) in a commercial field in 2009. Though Proline did not eliminate the disease, it significantly reduced the severity in treated plots and led to increased yields.
Use of Proline should be a key component of programs designed to manage CBR. Use of Provost is an effective compliment to early use of Proline.
3. Elast (dodine) was first used commercially for management of leaf spot diseases in 2009. Additional research confirms that Elast is an effective protectant fungicide for use against leaf spot. However, Elast may not be quite as effective as other leaf spot fungicides if used season-long.
It is now recommended that Elast be used earlier in the season and replaced by fungicides with some systemic activity in the mid- and late-season applications.
4. Eminent 125SC (tetraconazole) is a new fungicide labeled for use in management of leaf spot diseases and research in 2009 confirmed its effectiveness. Eminent 125SC will be sold as a co-pack with Echo (chlorothalonil) for leaf spot management in 2010.
5. Recent research on the biological nematicide NemOut suggests that this product is also efficacious in the management of peanut root-knot nematodes. It can be applied both in the furrow at planting time and at pegging time. One recommended use of NemOut would be to use 0.3 pounds per acre at planting followed by Temik 15G at 10 pounds per acre at pegging time. PG
From the 2010 Peanut Disease Update by Bob Kemerait, Tim Brenneman and Albert Culbreath, University of Georgia plant pathologists. To view a copy of the 2010 Peanut Information, go to www.ugapeanuts.com, and click on 2010 Peanut Update.