Quantcast

Insects in Soybeans are a Concern That Should be Addressed Says - KOAM TV 7

Insects in Soybeans are a Concern That Should be Addressed Says Extension Specialist

Updated:

FROM THE UNIVERSITY OF MISSOURI EXTENSION OFFICE IN BARTON COUNTY

Insects in Soybeans are a Concern That Should be Addressed Says Extension Specialist

LAMAR, Mo. – The pods on soybeans are beginning to fill. With that stage in growth comes an increased concern about prominent pests.

According to Jill Scheidt, agronomy specialist with the University of Missouri Extension, weather conditions are creating situations suitable for insects not commonly seen.

“For example, two-spotted spider mites are usually not a problem this time of year, but with temperatures being hot and dry, they could pose a problem,” said Scheidt.

Spider mites are usually translucent in color and can be identified with a hand lens by the two dark spots on the sides of the abdomen. Spider mites also have sucking-piercing mouth parts and feed on the underside of leaves. If a leaf is held up to the light, it is possible to see the webs glistening on the underside of the leaf.

Threshold levels for spider mites are 20 percent yellowing before pod set and 10 percent yellowing after pod set when mites are present.

“A high rate of insecticide must be used to kill spider mites. If a high rate is not applied, the insecticide will kill beneficial insects that control spider mite populations,” said Scheidt.

Thrips are similar in size to spider mites and vary in color from yellow to dark brown, but can be identified by horizontal stripes on the back of their lower body. Thrips are thought to transmit soybean vein necrosis. Thrips are a rare pest in soybeans, so threshold levels have not been determined yet.

Green stinkbugs, both the nymphal and adult stages, attack primarily the seeds and pods of soybean plants. They also will feed on soybean plant stems, foliage, and blooms.

Green stink bugs have piercing sucking mouthparts and punctures can be identified by the presence of small brown or black spots. Green stinkbugs are bright green and are identified by the dark bands on their antennae.

“Direct feeding damage can lead to a reduction in seed quality and quantity. Young seeds can be deformed, undersized or even aborted. Older seeds will be discolored and shriveled. The germination rate also will be reduced for beans produced as a seed source,” said Scheidt.

Indirectly, feeding damage by stink bugs can delay plant maturity and cause the abnormal production of leaflets and pods. Green stinkbugs can usually be found on the edges of fields first. Threshold levels for green stinkbug are 1 per foot of row during seed production.

Bean leaf beetles feed on pods once seed development begins. Bean leaf beetles are small insects about one-quarter inch long with black spots or stripes on their back. Their most identifying characteristic is the black triangle located on their forewings, just below the head.

Bean leaf beetles can clip pods and feed on developing seeds. Threshold levels for bean leaf beetle are 10 or more bean leaf beetles per foot of row and 20 percent defoliation or at least 15 bean leaf beetles per foot of row and at least 10 percent pod damage.

Pod worm moths, also known as corn earworm, like to lay eggs in an unclosed canopy in soybeans. Identify moths by the black banding on the hind wings. Pod worm eggs hatch 7-10 days after moth flights. Six weeks after moth flights is when pod worms could stop foliage feeding and begin feeding on pods and become a problem.

“Don't spray unless pod worms reach threshold, which is 1 pod worm/ft, because beneficial clover worms carry a fungus that kill pod worms, and may take care of the pod worms without a need to spray an insecticide,” said Scheidt.

Pod worms come in all colors, from brown with yellow spots to white with black spots and green. To distinguish pod worms from green clover worms, Scheidt says to look at their legs. Pod worms have four pairs of large abdominal pro-legs right in the center of the body while clover worm only has three pairs.

“Hero, Warrior II and Mustang Max are effective insecticides to control all of these insects in soybeans. Read the label for appropriate rates and water use for each pest. Remember if multiple insecticides applications need to be made, use a different mode of action to prevent insect resistance to insecticides,” said Scheidt.

For more information, contact any of these MU Extension agronomy specialists in southwest Missouri: Tim Schnakenberg in Stone County, (417) 357-6812; Jill Scheidt in Barton County, (417) 682-3579; John Hobbs in McDonald County, (417) 223-4775 or Brie Menjoulet in Hickory County, (417) 745-6767.

# # #

  • Local NewsMore>>

  • Local church offers free Easter meal for community

    Local church offers free Easter meal for community

    Sunday, April 20 2014 5:13 PM EDT2014-04-20 21:13:15 GMT
    The Easter holiday is a time when churches celebrate Jesus's resurrection with morning services and dinners. But one local church is hoping to spread Jesus's message even be The Easter holiday is a time when churches celebrate Jesus's resurrection with morning services and dinners. But one local church is hoping to spread Jesus's message even beyond this day.yond this day.More >>
    The Easter holiday is a time when churches celebrate Jesus's resurrection with morning services and dinners. But one local church is hoping to spread Jesus's message even be The Easter holiday is a time when churches celebrate Jesus's resurrection with morning services and dinners. But one local church is hoping to spread Jesus's message even beyond this day.yond this day.More >>
  • Study on sleep aid Ambien has doctors and patients weighing options

    Study on sleep aid Ambien has doctors and patients weighing options

    Sunday, April 20 2014 4:10 PM EDT2014-04-20 20:10:45 GMT
    The popular sleep aid medication Ambien can be raising the risk of heart attack by 50 % for some who take it, that's according to a recent study presented to the American Heart Association.More >>
    The popular sleep aid medication Ambien can be raising the risk of heart attack by 50 % for some who take it, that's according to a recent study presented to the American Heart Association.More >>
  • 50 thousand eggs at hunt in Miami

    50 thousand eggs at hunt in Miami

    Saturday, April 19 2014 10:35 PM EDT2014-04-20 02:35:48 GMT
    Great weather today for kids to grab up some of 50 thousand eggs during a tremendous Easter event. The Miami high school soccer fields were covered with spring colored eggs for the Miami first assembly e-14 egg hunt. Kids as young as toddlers up to those age twelve were able to get their hands on the eggs filled with toys and chocolate. While the event is fun for the whole family, organizers from The Miami First Assembly Church,want kids to take away more than just a few treats but a remin...More >>
    Great weather today for kids to grab up some of 50 thousand eggs during a tremendous Easter event. The Miami high school soccer fields were covered with spring colored eggs for the Miami first assembly e-14 egg hunt. Kids as young as toddlers up to those age twelve were able to get their hands on the eggs filled with toys and chocolate. While the event is fun for the whole family, organizers from The Miami First Assembly Church,want kids to take away more than just a few treats but a remin...More >>
Powered by WorldNow

KOAM - Licensed to Pittsburg, Kansas
Send tips, ideas and press releases to: tips@koamtv.com
Send newsroom questions or comments to: comments@koamtv.com
Phone: (417) 624-0233 or (620) 231-0400
Web comments or questions: webmaster@koamtv.com
Newsroom Fax: (417) 624-3158

Powered by WorldNow All content © Copyright 2000 - 2014 WorldNow and KOAM. All Rights Reserved. For more information on this site, please read our Privacy Policy and Terms of Service.