Description:
The cockroaches are 1-3/8 to 2-1/8-inched long when
mature, it is characterized by fully developed wings
that completely cover the abdomen. The pronotum
(i.e., shield like area behind the head) has a dirty-yellow
band around its edge.
The nymphs are ¼-inch long when they emerge
from the egg capsule and initially are gray-brown.
As they develop, they become more red-brown, and
the yellow band becomes more prominent on the pronotum.
The purse-shaped egg capsule(i.e., ootheca) is dark
red-brown in color, 3/8-inch long, and typically
has eight eggs per side.
Biology:
During her lifetime, the female American cockroach
produces from nine to ten egg capsules each of
which contains from 14 to 16 eggs. The capsules
are dropped or, using secretions from her mouth,
glued in protected locations such as cracks and
crevices near food sources. The nymphs molt from
10 to 13 times before becoming adults. This requires
about 600 days. Adult females live an average
of 440 days and males about 200 days. Large populations
of American cockroaches accumulate in secluded
locations because they live for such a long time.
Habits:
American cockroaches are not common pests in most
homes. They can be abundant in sewers and commercial
facilities, e.g., groceries, prisons, restaurants,
hospitals, and office and apartment buildings.
They prefer to inhabit warm, damp locations, e.g.,
steam tunnels and boiler rooms. They are strong
fliers and easily migrate from building to building.
In the summer, large numbers accumulate in outdoor
locations, e.g., in dumps, alleys, and yards,
and in the fall, migrate into surrounding structures.
Although they feed on a variety of materials,
they prefer fermenting foods.
Control:
Cockroaches often are brought into and moved between
facilities via equipment and storage boxes. Thus,
potentially infested products which are brought
into structures should be closely inspected. Many
types of cardboard and plastic sticky tapes are
available to help pinpoint sources of cockroach
infestation and to monitor areas about which occupants
have complained but infestations can not be visually
detected. Sticky tapes are not intended for control
but, rather, to guide and evaluate control efforts
as part of the inspection process. Visual inspections
can be conducted using a flashlight and oerasal
pyrethrin to flush cockroaches from their harborages.
An effective cockroach management program depends
on good sanitation in order to eliminate the food,
water and harborage they need for survival. It
is critical to reduce clutter as large cockroaches
like to hide in stacked boxes, cartons, rolled
carpeting and stored paper and cardboard material,
especially in dark, damp locations. Vacuum cleaning
can be used to physically remove exposed cockroaches.
American cockroaches are particularly sensitive
to drying so it is important to reduce moisture
by repairing leaks, improving drainage, and installing
screened vents in order to increase airflow. Permanent
reduction of cockroach population can be achieved
by caulking to eliminate harborage and prevent
entry into structures.
The most important cracks to eliminate include
those at which sinks and fixtures are mounted
to the wall and/or floor, around all types of
plumbing, baseboard molding and corner guards
where shelves and cabinets meet walls and door
frames, and cracks on a near food preparation
surfaces. Cockroach access routes from wall voids
into occupied spaces and around plumbing and electrical
fixtures should be sealed with caulk or grout.
Basement floor drains should be protected with
screens of basket inserts which must be cleaned
regularly.
Containerized, paste, dry, and gel baits have
become very popular in the industry and are very
effective products for eliminating cockroaches.
To maximize effectiveness, paste, gel and dry
baits should be applied with a syringe-like dispensing
tool in many small dabs or spots that are close
to harborage sites. Large, plastic bait containers
should be placed as close as possible to the dark
concealed spots where cockroaches are living,
preferably adjacent to edges and corners.
Large populations of cockroaches can be reduces
or eliminated with careful application of sprays
and dusts. Many insecticides break down rapidly
within the moist, hot locations these cockroaches
prefer so an appropriate formulation for the environmental
conditions must be selected.
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