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Extension Entomology

Bug Jokes of the Week

— Dr. Jeff Whitworth

Q: I just won a Halloween contest dressed as a bee! It was so exciting that I am still “buzzed” about it!

 

Q: What is worse than a worm in your apple?

A: half a worm

 

Q: What do spiders order at a restaurant?

A: French flies

Q: What can be on the ground and a hundred feet in the air at the same time?

A: A centipede on its back

 

 

Wheat Update – armyworms, grasshoppers

–by Dr. Jeff Whitworth

Some fields have already established good stands of wheat this fall. However, there are also some pretty well established fields of volunteer wheat (see pic provided courtesy of Jay Wisby). There have been reports of armyworms and grasshoppers causing concern in some wheat fields that are struggling because of lack of moisture, but the recent cold weather should control both armyworm and grasshopper feeding.

 

 

Alfalfa Update – aphids, potato leafhoppers

–by Dr. Jeff Whitworth

Pea aphids (see pic) are and have been returning, or at least increasing in numbers, to many alfalfa fields throughout north central Kansas. These are primarily cool weather aphids and are usually the last ones still feeding in the fall on alfalfa and the 1st ones in the spring. However, with the advent of cool/cold weather this late fall feeding should be negligible. Potato leafhoppers (see pic), for the most part, have emigrated, or at least are not present in easily detectable numbers, so “hopper burn” (see pic) and its consequences, should not be problematic this fall/winter.

 

Pea aphids

 

Potato leafhopper

 

Hopper burn

 

Alfalfa and Soybeans

–by Dr. Jeff Whitworth

Green cloverworm adults (see pic) have been very common in soybean and alfalfa fields the last couple of weeks, and this has caused concern about potential green cloverworm infestations next year. However, green cloverworm adults are, or have been, migrating to the southern US for overwintering. Thus, since they do not overwinter in Kansas, infestations next year will depend on wherever the adults come back to, so predicting future infestations after overwintering adults return from the southern US are not possible.

Adult green cloverworm

 

 

 

Green June Beetle Larvae

–by Dr. Raymond Cloyd

We have received numerous inquiries regarding large grubs (larvae) crawling on their backs across pavements or other hard surfaces. Well, these are the larval stage of the green June beetle, Cotinis nitida. Larvae are 3/8 (early instars) to 1-1/2 (later instars) inches long, and exhibit a strange behavioral trait—they crawl on their back (Figures 1 and 2)—likely due to having a constant itch J. This behavior of crawling on their back is unique among turfgrass-infesting larvae.

 

 

Fig 1. Green June Beetle Larva (Grub) Crawling On Pavement Surface (Auth–Raymond Cloyd, KSU)

Photo for Fig. 2 not available

 

The larvae are abundant now due to the excessive moisture (rain) we have received. Young larvae are generally located at the interface between the soil and thatch layer feeding primarily on organic matter including thatch and grass-clippings; preferring material with a high moisture content. The larvae can be found in swimming pools, garages, and basements. Green June beetle larvae can tunnel 18 inches into the soil; and even deeper in sandy soils.

 

 

 

 

 

 

Wheat

–by Dr. Jeff Whitworth

 

Some reports are being received mainly from south eastern/south central Kansas relative to “worms” feeding on early-planted wheat. First, it is usually better to plant wheat as late as possible to help avoid all wheat pests, whether pathogens or insects. The “worms” reported so far, have been either armyworms or fall armyworms, both of which will do about the same type of damage. They feed on leaf tissue and consume more, as they get larger, thus it is best to monitor wheat fields early to detect any larvae while they are still small. They usually do not reduce wheat stands, just remove the leaf tissue, but under stressful growing conditions plant stands may be impacted. Under good growing conditions, plants should be only temporarily affected. However, if there are 8-10 worms per sq. ft. and the worms are small, i.e., less than ½”, treatment may be justified. Remember also, if the leaf feeding continues into the winter it might be caused by army cutworms, which will feed all winter anytime temperatures are over 45 F, and into the spring. However, armyworms and fall armyworms will only feed until the 1st hard freeze, but not through the winter.

 

Sorghum

–by Dr. Jeff Whitworth

Most sorghum throughout north central Kansas is past the soft dough stage, thus not susceptible to “headworms.” However, a few late-planted fields, just coming into the “boot” stage, have sporadic small colonies of sugarcane aphids (SCA) (see pic of SCA’s from Saline and Dickenson counties (pic3)). However, there seems to be significant numbers of beneficials, but these late developing fields should still be monitored as these populations can “explode” quite quickly.

(Pic 3) SCA Colony

 

 

Soybeans

–by Dr. Jeff Whitworth

Most soybeans in north central Kansas, even double cropped fields, are getting to the stage where the pods are hardened enough to protect the beans inside (see picture of pod feeding scar by bean leaf beetles and an adult bean leaf beetle (pic1). Woollybear caterpillars (pic 2) are becoming more noticeable as the soybean leaves start to senesce, the caterpillars are getting larger and thus more visible, and as they move to the ground, looking for overwintering sites.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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