Marais des Cygnes National Wildlife Refuge
Mountain-Prairie Region
sun, clouds and rain graphicbuzzing fly graphic BIOLOGICAL AND CLIMATIC HAZARDS TO AVOID

Insects, heat and humidity, rain, and blackberry brambles can be very troublesome.  However, awareness of these hazards can greatly diminish suffering.

CHIGGERS are generally found in grassy areas from late May through September.  They are nearly impossible to see.  Bites cause small red marks which itch more than you can possibly imagine.  They are easily repelled with insect repellants containing DEET or sulfur powder.  Apply these products wherever grass may come in contact with your clothes.   Apply especially liberal amounts where clothes fit tight on the body such as behind the knees, around waist, feet/ankles, and arm pits.

If you suddenly realize you may have traveled through prime chigger habitat without having used repellant, the best approach is to place clothes in a plastic bag and seal, then shower with hot water and soap as soon as possible.  If you cannot do this then apply a liberal amount of repellent on them and hope they hop off of you.  Also, remember that if you drive to a motel or home to shower, your car seat may be covered with chiggers.  Before returning to your seat you will need to use some kind of repellant or other product to remove them.  A severe case of chigger bites will cause many sleepless nights and may also result in a low grade fever - take them seriously!

WOOD TICKS encountered on the refuge are generally one of three different species.  They are most prevalent in areas with an abundance of low grassy/herbaceous vegetation, especially where many deer trails are present and immediately adjacent to deer trails.  Dense woods with sparse ground vegetation is actually where you are least likely to encounter wood ticks.  The time of year when wood ticks are most prevalent is late April through June, though a few may be encountered nearly anytime of the year.

Occasional cases of Rocky Mountain Spotted Fever and Lymes Disease have been reported in the county.  These diseases are caused by wood tick bites. It is believed however that wood ticks cannot instantly transfer disease but must remain attached for a specified period of time to cause disease transfer and that only a small percentage of the wood tick population is capable of transmitting disease.

Insect repellants containing DEET can greatly reduce the number of wood ticks encountered.  Spray all portions of clothing which may come in contact with grassy or herbaceous plants.

The most troublesome type of wood tick is locally referred to as a "seed tick".  They are about the size of a pin head and are very difficult to see.  They are sometimes encountered in large groups locally referred to as a "nest".  If you find a nest of seed ticks on you the best approach is to place clothes in a plastic bag and seal, then shower with hot water and soap as soon as possible.  If you cannot do this then apply a liberal amount of repellent on them and hope they hop off of you.

MOSQUITOES are generally not a problem.  They can be troublesome at periodic times of the year if you sit in one spot for quite a while and are near an area of shallow standing water.   They are generally repelled by common insect repellants as long as you don’t sweat off the repellant.

HEAT and HUMIDITY are a climatic feature which add greatly to the robustness and diversity of the local vegetation and unfortunately the suffering of humans.  Late May through September is the predominant period of heat and humidity.  Temperatures during this period can be expected to be in the mid 80's to upper 90's with humidity readings in the same range.   There are periodic breaks in the heat and humidity but they are generally infrequent and don’t last for very long.  Fortunately the heat usually does not become extremely unpleasant until sometime between 10:00 and 12:00 am.   The heat of the day usually does not subside until after sunset.  The best way to beat the heat is to avoid the hottest times of the day.  If you cannot or do not want to do this then try to stay in the shade and drink lots of liquids with electrolytes.

RAIN can cause a lot of misery if it is not prepared for.  Waterproof boots and breathable rain gear can add greatly to comfort.  The average yearly rain fall for the refuge is 39 inches.  Unfortunately, most of this rain seems to fall during a small part of the year, usually in mid to late spring and again in mid fall.  However, being located in the middle of the continent makes rain prediction tricky.  It can rain heavily any time of the year.  Once the ground is saturated even small rains of 1/4" can cause rivers and streams to flood.  Be extremely cautious of walking or driving through flooded areas.  Seemingly motionless water can have swift currents and roads are often flooded at much greater depths than is apparent.

BLACKBERRY BRAMBLES can be found as rather extensive stands along forest edges and in other open areas of the refuge.  Don’t try to go through a large patch - you will curse yourself for it.   However, other than scratches, torn clothes, and imbedded thorns you will live through an encounter with blackberries.

Last update: October 13, 2009