Cotton Thrips Management- Focus on Tank Mixes With Herbicides

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Article by Curtis Fountain, Duplin County Agent

The TSWV and Thrips Risk Forecasting Tool (used primarily for tobacco) notes the tobacco thrips 3rd generation flight is expected to begin May 15 (Kenansville area).

Thrips damage cotton seedlings by puncturing/rasping the outer cells of young leaves and buds. Damage can result in crinkled or possom-eared leaves. Damage can stunt growth, result in fruiting at higher positions, result in maturity delays, and reduce yield.

If a foliar thrips spray is needed, acephate* is commonly used. For 75S formulations, the suggested rate is 5 ozs/acre. For 90-97S formulations, the suggested rate is 4 ozs/acre.

For palmer amaranth management, glyphosate* + a residual herbicide (acetochlor* or S-metolachlor*) postemergence is recommended for glyphosate-tolerant varieties approximately 14 days after planting (2-3 leaf cotton). For palmer amaranth management, glufosinate* + a residual herbicide (acetochlor* or S-metolachlor*) postemergence is recommended for glufosinate-tolerant varieties approximately 14 days after planting (2-3 leaf cotton). See 2014 Cotton Information Page 117 for additional information.

Recognize the residual herbicide (acetochlor* or S-metolachlor*) will result in some foliar burn. Recognize glufosinate* will result in some foliar burn on Phytogen WideStrike varieties. High temperatures and wet plants will increase foliar burn. Do not add spray adjuvants (surfactants, ammonium sulfate, etc.) unless required by the herbicide label.

If acephate* is added to the herbicide combination, foliar burn will increase.

*
acephate (Orthene, etc.)
glyphosate (Roundup, etc.)
acetochlor (Warrant)
S-metolachlor (Dual, etc.)
glufosinate (Liberty).

Click here for the April 30 Tips For Cotton Thrips and here for 15 May Cotton Thrips Update written by Dr. Dominic Reisig, NCSU Extension Entomology Specialist.