Kansas State University


Extension Entomology

Tag: pupation

Soybean Update — Green Cloverworms

— by Dr. Jeff Whitworth and Dr. Holly Schwarting


Green cloverworm larvae have been very numerous throughout north central and south central Kansas for the past 30-45 days.  However, the larval stage and the leaf defoliation that they’re known for, has pretty much ceased as most larvae have entered, or are entering, pupation.



A few green cloverworm larvae can still be found in late planted beans and alfalfa, but for the most part, their feeding will soon cease.  The most common question is, with all these green cloverworm adults around, will they be in the same fields next year?  They do not overwinter in Kansas and most soybean fields will be rotated, so the answer is no.  If the same fields are infested next year, it will not be because of the green cloverworms that survived the winter in that field.


Alfalfa – Weevils and Aphids

–by Dr. Jeff Whitworth and Dr. Holly Schwarting

Alfalfa weevil feeding seems to be slowing as pupation has started, but there are quite a few larvae still active.

AW pupa

AW different sizes

The photo below is of our insecticide plots which were treated 8 days after the surrounding alfalfa field, thus the dramatic visual difference insecticide timing can make.

KSU plots 2016

Also, there are some aphids present in the alfalfa.  Dr. Stu Duncan, KSU Agronomist, reported some spotted alfalfa aphids from the AltaVista area and we have a few in our plots in Dickinson Co.  Pea aphids have been present since early March and continue to be found in relatively low numbers.

spotted aphid

spotted aphid