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Tuesday, July 28, 2015

SNAILS AND SLUGS BY DR. DONALD LEWIS

Nick Christians
nchris@iastate.edu
July 28, 2015

Here is the latest blog by Dr. Donald Lewis, Entomology Extension, at Iowa State.  It is in repsonse to Jim Woods of Woods Lawn Service in New Sharoin, Ia., who sent in the picture below.




Donald Lewis
Donald R. Lewis, Extension Entomologist
Department of Entomology
104 Insectary Building
Iowa State University, Ames IA 50011



 Here are Don's thoughts on the subject:




Snails and Slugs in a Wet Year

A message from alert reader Jim Woods from Woods Lawn Service in New Sharon prompted a review of what are slugs and snails and why are there so many of them this year?

Slugs and snails are animals on a very large branch of the Animal Kingdom family tree called Mollusca.  The best known molluscs are the clams, oysters, squids and octopuses.  The closest relatives of snails are the clams and oysters, called the gastropods.  The name gastropod literally translates from Greek to mean stomach-on-foot.  The large fleshy foot that protrudes from the shell of a snail or oyster and on which they crawl, also contains the mouth opening.

Snails and slugs are very nearly the same thing!  The easy distinction is that slugs are snails without the shell.

The few molluscs and gastropods that have evolved to live on land rather than in the water still require a lot of water to thrive.  They are active at night when humidity is higher and spend the daytime hidden in damp locations such as under mulch, leaf litter and debris on the ground (an exception being cloudy, rainy and humid days).

Snails and slugs do best in damp environments.  That's why slugs are such a pest of hostas because hostas grow in a garden that is shaded and holds the moisture longer.  http://www.ipm.iastate.edu/ipm/hortnews/2009/7-15/slugs.html

Slugs and snails also do well in rainy summers like this one.  During drought years they almost disappear from sight.  Prolonged periods of wet weather, however, have the opposite affect and numbers become noticeable. 







Wednesday, July 15, 2015

JAPANESE BEETLES SHOWING UP IN CENTRAL IOWA

Nick Christians
July 15, 2015
nchris@iastate.edu

Here is a post from Dr. Donald Lewis of the ISU Entomology Department to Larry Ginger of American Lawn Care in Des Moines, IA.  Larry had submitted some pictures of Japanese Beetles earlier this week.
 Dr. Lewis is at drlewis@iastate.edu.


Thanks, Larry.

Japanese beetle populations appear to be slowly recovering from their near-complete population crash over the winter of 2013-14.  After seeing almost no JB last summer we are receiving reports from across most of the state, with most observers saying they have seen “a few.”  The exception appears to be western Iowa where slightly more are appearing in some places where they were not previously reported.

This week we have also received a report of activity by adult green June bugs, Cotinis nitida.  These very large, inch-long scarab beetles are highly variable but generally velvety green over most of the body with variable golden-brown markings on the edge of thorax and wing covers.  See BugGuide for photos.  http://bugguide.net/node/view/520

The green June beetle has only been reported in 10 counties within Iowa.  Please send specimens or photos if you see them outside the currently-reported counties:  Harrison, Pottawattamie, Fremont, Page Greene, Polk, Scott, Muscatine, Des Moines, Lee.

Thanks.

Donald Lewis




The first 3 pictures are from Larry Ginger.





This picture of Green June Bug is from Dr. Lewis.