Fall Invaders

The following was cross-posted from the Extension Entomology website.

In spite of our continued warm weather, several of our typical cool-weather pests have begun their fall invasion of homes and commercial buildings.  This is actually not surprising since this move to seek overwintering sites is due not just to temperature but also the shortening day-length and decline in suitable food plants.

Kudzu bugs on white house trim

Kudzu bugs aggregating on the fascia board of a house. (Dan Suiter – University of Georgia)

Kudzu bugs are moving out of kudzu and soybean fields and flying to nearby structures, particularly those with light-colored siding (as seen in the figure to the right).  As many people discover, spraying siding, window trim, etc. is likely to produce mediocre results even if repeated sprays are applied.  Many of the labels for the pyrethoid pesticides (those containing chemicals such as lamda-cyhalothin, cyfluthrin, bifenthrin, etc.) also limit their application to vertical areas above impervious surfaces (such as driveways, sidewalks, patios) where rain could wash the chemical off the treated surfaces and allow them to run off into storm drains.  We have additional information at:

 

Brown marmorated stink bug adult

Brown marmorated stink bug adult (Photo: Kristie Graham, USDA ARS, Bugwood.org)

Brown Marmorated Stink Bugs (BSMB) are also making their presence known across the state, particularly in the Piedmont, Foothills, and western NC.  This pest causes significant damage to a wide variety of fruit, vegetable and row crops as well as ornamentals.  Although control is possible for these crops, preventing the stink bug’s invasion of homes is difficult.  As with kudzu bugs, surface sprays to building exteriors or around windows and doors is rarely effective.

For more information about BMSB, visit:

 

Paper wasp nest on wooden beam

Polistes wasps nest (Photo – M. Waldvogel, NC State – Extension)

Paper Wasps (Polistes sp.) colonies reached their peak size a few weeks ago with the production of next year’s queens and are now starting to disperse.  Although the workers and this year’s queen will die over the next few weeks, some workers along with next year’s queens will abandon their nests and look for overwintering sites.  This activity often results in wasps finding gaps near chimneys or roof ridge vents or windows and doors and then showing up indoors.  Many people assume that there is an active nest inside a wall or some other hidden area (e.g., attached to the underside of a deck).

However, the wasps could also be coming from nests out in storage buildings, tree holes, firewood piles, old unused cars, or other items that have been undisturbed for much of the summer.  Spraying the exterior of the building (not spraying a specific nest) is not going to keep this activity which will continue until we see cold (frost).  Even then, warm winter days may cause the wasps to become active.  Bear in mind that there is not a functioning nest and so the wasps are not aggressively defending a nest. However, if you step on one or swat at one, it may sting in defense..

We have more information at: Controlling Paper Wasps in and Around Structures

Mike Waldvogel and Patty Alder, NC State University Extension

New Pest Invading North Carolina

Note:  This is being cross-posted from the Entomology Extension Portal.

Distribution of Asian longhorned tick in North Carolina

We have had requests for information about the Asian longhorned tick (Haemaphysalis longicornis) which is an invasive species that was initially reported as found on sheep in New Jersey in 2017.  However, the USDA-APHIS found a specimen in a sample of ticks that had been collected in West Virginia in 2010 and initiallly misidentified as lonestar ticks.  As of October 1, 2019, the Asian longhorned tick has been reported  in twelve states (AR, CT, DE, KY, MD, NJ, NY, NC, PA, TN, VA, and WV).  In North Carolina, this tick has been found in five counties during the last three years although each case involved one animal or one site.   We now have a publication about the tick’s biology available at:

https://content.ces.ncsu.edu/asian-longhorned-tick

 

Samantha McPherson Receives 2019 NCPMA Graduate Student Scholarship

Samantha McPherson (right) with Marie Horner - NCPMA Region 2 Director.

Samantha McPherson (right) with Marie Horner – NCPMA Region 2 Director.

NCSU Entomology graduate Samantha McPherson is the 2019 recipient of the North Carolina Pest Management Association Graduate Student Scholarship.  The $1500 scholarship is awarded annually by the NCPMA’s Education Foundation.  Samantha is working under the direction of Dr. Jules Silverman and Dr. Coby Schal and studying diet affects the reproductive success of German cockroaches.

“Bug Bombs” are ineffective

German cockroaches and their feces on a wall

German cockroaches and feces (Image courtesy of Coby Schal – NCSU)

Researchers at NCSU have published a study showing that “Total Release Foggers” (or “TRFs”) are ineffective at controlling German cockroaches.  The study published in BMC Public Health  found that the foggers do not reach areas where cockroaches may be hiding and can increase pesticide concentrations in homes by as much as  600X (a median of 85X).  Baiting is far more effective at controlling German cockroaches and reducing potential asthma triggers that result from infestations and the use of certain insecticides. For specific details of the study, click HERE