Category Archives: Insects

Sugarcane aphids and harvest aids

Author: Scott Stewart, IPM Extension Specialist No Comments

The questions of the week have been … when/if should I put an insecticide out with my harvest aid for sugarcane aphids in sorghum, or if you are still a week or more from making a harvest aid application, should you hold off with the insecticide until making this application. First, I’ll refer you to a good article from Mississippi State University from last week. This article also addresses if, when, and what harvest aids can be applied. Continue reading

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Green cloverworms and loopers in soybean, etc.

Author: Scott Stewart, IPM Extension Specialist Comments Off

Calls on soybean insect infestations are not common, and most folks are reporting less than average infestations of stink bugs. However, green cloverworms are being reported in some fields at or near economic treatment thresholds. Treatment is recommended when Continue reading

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Update on Sugarcane Aphids in Sorghum

Author: Scott Stewart, IPM Extension Specialist Comments Off

Although a common comment this week has been that sugarcane aphid (SCA) infestations are not spreading rapidly, with most infestations concentrated on field edges, we are steadily treating more and more sorghum fields. You can assume SCA are present in essentially all fields in West Tennessee, but fields requiring treatment are scattered across the area (see below). It hasn’t always been true, but a common theme is that many of the fields treated within the last few weeks with a pyrethroid insecticide are those that have required treatment for aphids. Continue reading

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Last Effective Bloom Date: how is it calculated and what does it mean?

Author: Tyson Raper, Cotton & Small Grains Specialist 1 Comment

IMG_1876By definition, the last effective bloom date is the day in which the probability of a new flower developing into a boll and making its way into the basket declines to below 50%.  Since it is unlikely (probability less than 50%) that fruiting positions which develop after this date will contribute to yield, end-of-season insecticide termination and defoliation recommendations for our area are based upon protecting/managing  those positions which will be flowering Continue reading

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When can I quit worrying about sugarcane aphid in sorghum?

Author: Scott Stewart, IPM Extension Specialist Comments Off

This has been a common question, and the short answer is you could potentially have to spray for sugarcane aphids until near the time harvest aids are applied. The direct effect of aphids on yield will diminish rapidly after soft dough. Unfortunately, there are some bad experiences with  Continue reading

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Headworm Control in Sorghum

Author: Scott Stewart, IPM Extension Specialist Comments Off
Corn Earworm
Corn Earworm

My counterpart in Mississippi, Dr. Catchot , wrote a good article last week on this topic (link here). Headworms are a common problem, especially on later milo. This includes corn earworm, fall armyworm, and sorghum webworms. Typically corn earworm is the most common species present. The treatment threshold for corn earworm or fall armyworm in one or more larva per head. Count sorghum webworms as equivalent to 1/3 of a corn earworm … they are smaller and do less feeding. Continue reading

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