“Any place we applied Diamond, yield was significantly better than where it wasn’t used,” Gore says. “But when we applied it the third week of squaring, yields were significantly better than for all of the other later treatments.”

Second and third applications of Diamond later in the year didn’t add much in terms of yield, he notes. “But that’s not to say applications later in the season can’t be useful in terms of protecting the crop that’s left — we just didn’t see much additional impact from a yield standpoint.

“Applying Diamond during that early season window when adult plant bug numbers peak appears to provide the best control and best yield benefit. Gordon Snodgrass (USDA-ARS) showed that second, third, and fourth instar nymphs are as much as 10 times more tolerant of Diamond than first instar nymphs. By getting Diamond out early, as nymphs hatch they will be exposed to the material, even if at a low level, and control will be more effective.”

Also, research by Fred Musser at Mississippi State University showed that when adults had been exposed to Diamond, a very low percentage of their eggs actually hatched.

Some “new” versions of earlier materials that are effective for plant bug control, Gore says, include:

• Fyfanon plus ULV from Cheminova, is labeled on cotton at 8 to 16 ounces, and in studies “has shown a sharp decline in both nymph and adult numbers.” This material is currently available.

 • Brigadier from FMC, is currently labeled on cotton, soybeans, and peanuts, with broad spectrum activity on bugs and caterpillars

• Belay from Valent, a neonicotinoid labeled on cotton and soybeans, “looks pretty good on plant bugs.”

• Bidrin XPII from Amvac, should be available this season as a premix for bugs only in cotton. “It’s no longer a co-pack, which should make it more convenient to use and still provide good control of plant bugs.”