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• In recent years development of site specific delivery systems on row crops has been virtually stopped by a lack of reliable nematicides to deliver.
ESTILL, S.C., grower Doug Jarrell used variable rate nematicide technology on peanuts and cotton.
Readings can be dramatic
Readings from the Veris system can be dramatic, Khalilian says. For example, in one field on the Edisto REC a nine percent increase in the Veris reading resulted in 57 percent less nematodes.
Finding viable research on how much yield advantage on peanuts comes from reducing nematode numbers is difficult, though using Veris readings to develop on-farm maps of high, medium and low risk areas is a good starting point.
Several variables affect the readings this system gives. If soil moisture, salt content or organic matter is high, the system will give high numbers. Soil texture is the critical factor, the Clemson researcher stresses.
“If I map here at the Edisto Station today and we get a big rain tomorrow, the readings would change, but the zones would be the same,” he says.
Jarrell says the nematode management plan developed by Thomas Ag Crop Management was right on target for his farming operation.
“There is no doubt using Telone on our nematode hot spots paid off. We monitor nematode samples closely and you can see the results in lower populations and in higher yields,” he says.
Crop rotation is another big factor in managing nematodes.
“We started growing peanuts in 2004, and noticed cotton yields went up in fields following peanuts. We had always known we had a nematode problem, but this really demonstrated how much yield we were losing,” Jarrell adds.
South Carolina Peanut Specialist Scott Monfort has worked with nematodes throughout much of his professional life, including a number of years in the University of Georgia and University of Arkansas systems.
He points out that South Carolina is fortunate to not have peanut root knot nematodes — by far the greatest nematode threat to peanuts.
Much of the research done on variable rate application of nematicides in the Southeast has been done on cotton, Monfort says.