Purchase Area Master Gardener Association

(PAMGA)

PESTS

It's summer and there are bugs aplenty in area gardens.

Japanese Beetles.  The bane of many a gardener, Japanese Beetles begin their life cycle as grubs.   While Japanese Beetles favor plants in the rose family, when hungry they are not picky and will eat most any available plant material.  A dose of Sevin seems to have the most lasting deterrent effect but still must be reapplied every 7-10 days.  Traps are popular, but if used should be placed far away from desirable plants.  The traps work by attracting beetles.  You will defeat your purpose by deliberately bringing them to the area you are trying to protect.  (photo submitted by Shirley Edwards).

 

 

 

Blister Beetles
Blister beetles have long (3/4 to 1/4 inch), blister beetlesnarrow bodies, broad heads, and antennae about 1/3 the length of the entire body.  Front wings are soft and flexible in contrast to the hard front wings of beetles.  Three common Kentucky species are:

black blister beetle - jet black
striped blister beetle - with orange and black stripes on wing covers
margined blister beetle - black with thin gray stripe around wing covers

Blister beetles are common but haven't been found in high numbers in Kentucky.  Historically they are most abundant in arid regions of the US where grasshoppers are in regular supply.  Adults feed on leaves in tops of plant but are especially attracted to flowers where they feed on nectar and pollen.  They gather in groups, so large numbers can occur in concentrated clusters in a field.  These beetles are mid to late summer insects, active in mid-June and early August which translates to the third or fourth cutting.

Female blister beetles lay clusters of eggs in soil in late summer.  The small, active larvae that hatch from these eggs crawl over the soil surface entering cracks in search of grasshopper egg pods deposited in the soil.  After finding the egg mass, blister beetle larvae become immobile and spend the rest of their developmental time as legless grubs.  The next summer they transform into the pupal stage and soon emerge as adults.  Thus, blister beetle numbers increase dramatically following high grasshopper populations.

This photo was submitted by Shirley Edwards.  She found them chewing on Japanese Anemones in her Marshall County garden.  She disagrees (I'm guessing from personal annual experience) with the UK statement that blister beetles have not been found in high numbers in Kentucky.  They had already chewed a big clump of pink anemones and she hoped they wouldn't find the white ones.  The blister beetles showed up and nearly defoliated the plant in a matter of hours.  She noticed they dined on foliage but the bloom bud was untouched.  From Shirley's observation, "they chew up a plant faster than Japanese beetles.  They come in droves and leave after the plant is totally destroyed if [anything is] left."  Learn more about blister beetles at http://www.uky.edu/Ag/Entomology/entfacts/fldcrops/ef102.htm

Purchase Area Master Gardener Association, 2705 Olivet Church Road, Paducah, Ky 42001 270/554-9520  FAX 270/554-8283  www.pamga.org