We feel that using the dynamic threshold, which stresses a 10 percent internal damage threshold for quarter-sized bolls during weeks 3 through 5 of the bloom period, will keep stink bug damage low and also not waste unnecessary insecticide applications.

You can find much more detailed information about stink bug identification, damage symptoms, scouting procedures, threshold use and much more by reading and using our new stink bug decision app.

The development of this app was supported by funding from our North Carolina Cotton Producers State Support Committee via Cotton Incorporated.

The use of this app, like any stink bug scouting procedure, requires scouts to make at least weekly boll assessments for internal damage to receive the most benefit from this app.

Bollworms – where are you?

Dominic Reisig conducted some corn ear assessments this past week (see Earworm populations low in corn: What does that mean for cotton, soybeans). Corn earworm infestation levels on ear tips in these assessments were very low compared with other years.

Additionally, it appears the progress of this generation is more than a week behind schedule, thus hopefully delaying our major corn earworm moth flights into cotton, soybean and other crops this year — perhaps one small plus in an otherwise tough year agronomically.

Finally, light trap counts in Scotland County indicate our major bollworm moth flight had not begun in southern North Carolina as of this past Wednesday.

Other cotton pests

Calls about spider mites have subsided somewhat, but mites still seem to be hanging around, even if mostly at low levels.

This seems like good plant conditions for cotton aphids, with at least one population in eastern North Carolina being difficult to control with chloronicotinoids.

If control difficulties are found after treating with Admire Pro, Centric, Belay or Intruder, alternatives such as Carbine and Transform have different modes of action and should be used for possible subsequent sprays.

Remember that aphids are nice, juicy, essentially immobile targets for biocontrol in North Carolina, so if the rounded aphid mummies or the fungus is found, an insecticide will probably not be needed in many cases.

 

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