What is in this article?:
- Upper Coast cotton suffers from dry conditions, pest risk
- Verde plant bugs
- The Upper Texas coast and crops are now showing signs of drought stress
- Upper Coast cotton update includes pest warnings.
- Forecasts are promising for next few days.
Verde plant bugs
Adult verde plant bugs are a quarter-inch long, narrow-bodied, and light green. The insect goes through several molts or instars (nymphs). Differences between verde plant bugs and cotton fleahoppers make identification between these two pests easier for producers. Verde plant bugs are generally bigger than a cotton fleahopper, with the smallest verde plant bug nymph about the size of a large cotton fleahopper nymph.
Crumley also warns cotton producers to check for bollworms, especially in non-Bt fields. No worms have been detected across the region but 4 to 6 percent of cotton plants have demonstrated damaged squares with evidence of bollworm eggs in some fields. He reminds growers with Bt cotton that worms must eat until they consume a lethal dose; he currently recommends keeping a watchful eye on egg development or increased signs of damage before taking more serious action. Treatment for bollworm eggs is not recommended, largely because of the effective control by predator insects.
Beneficial numbers of predator bugs in cotton are currently moderate to high with lady beetle adults, big eyed bugs, minute pirate bugs, green lacewing eggs, and damsel bugs being found across the Upper Coast.
Cotton aphids have also been detected in the Upper Coast region. Increasing populations of aphids are continuing to be found in many of the program fields, but, with a handful of exceptions, most are below the economic threshold. But Crumley says with the noticeable recent increase in aphids, populations can and will rise quickly. If they do, he says technology in recent years has provided a number of effective chemicals to fight aphids, including Centric, Intruder, and imidacloprid (Provado and Leverage).
More recently, he says, Carbine has shown good cotton aphid activity in other parts of the Cotton Belt as well as in Texas with fair results over the past few years.
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