Horticulture Hotline 02/14/22
Since I have been writing and talking about preemergent herbicides a lot lately, I’m going to include two pictures – one person used a preemergent product for winter weeds (nice dormant zoysia grass lawn) and one didn’t (a mess of green weeds). It is time to use a preemergent weed control product for small seeded summer annual weeds. What are you going to do?
This week I am going to try to cover cockroach. The cockroach always wins the most called about / asked about insect award, and is second to the mole in the overall called about / asked about pest. The person asking about roaches is never the person with the issue. They are always asking for their brother, mother, cousin, friend, …
There are many different species of roaches (at least 69). I’m going to concentrate on the most common roaches that dwell in the Lowcountry. To most people the roach is like a snake – the only good one is a dead one.
For controlling roaches, you want to think like a roach, monitor the situation, employ non-chemical strategies, and use control products (organic, Green, conventional) if needed.
The German cockroach is the small roach that likes kitchens and bathrooms. These roaches like to live inside and can be introduced to your house from boxes or containers that are carried into your house. Boxes are like a hotel for roaches and more and more boxes are coming to our homes. German roaches multiply very quickly once inside.
The American cockroach AKA “water bug”, “Palmetto bug”, and “South Carolina state bird”, is the other main cockroach in this area. These roaches like to live on boats, in sewers as well as in your house.
The Brownbanded cockroach is also common to this area. These roaches like to live up high in cabinets, high shelves in closets, pantries, desks, bookshelves or other areas away from the kitchen. The Brownbanded cockroach can live in drier areas than the German roach and usually will inhabit these areas so it does not have to compete with the German roach. The American and German cockroach will out compete the Brownbanded cockroach.
There are other species of cockroaches in this area, and if you control the above three species, you will most likely control the others as well. Asian cockroaches in mulched beds are becoming more of an issue. First you will want to monitor and identify which species is bothering you. There are glue boards you can put out in areas you have seen them. You can look for fecal pellets and egg casings – “Honey, what are you doing?” – “I’m looking for roach fecal pellets and egg casings” - “No football on today?” …. We also sell these aerosol “flushing agents” that you can spray in areas that you suspect activity, and the roaches will quickly come running out of hiding, giving you the opportunity to personally smack them.
If you have roaches, sanitation is really important. Keeping dirty dishes, garbage and sources of water to a minimum will help limit the population of roaches. Even clutter in a house provides harborage sights for the roach. Caulking cracks, weatherproofing windows and doors, sealing pipes and eliminating other entry points will also help with roaches as well as other pests.
For control products the baits inside the house do a very good job. These baits exploit all the bad habits of roaches. Baby roaches eat the fecal pellets of adult roaches to develop into adult roaches themselves. Roaches also cannibalize their dead. So, if one roach eats the bait, poops, then dies. Another roach will eat this poop and eventually die. Another roach will see the dead roach and eat it and die as well. This transfer of active ingredient creates a great “domino effect” that has impressed many people. The specific nature of this application and the low amount of active ingredient used makes this control method a “green” application, depending on the product you use.
Using the growth regulators, either Gentrol or Nylar, will also help break up the roach’s life cycle. These growth regulators will extend the period of control.
Outside you will want to do a perimeter treatment. There are several products on the market that will nail these roaches (along with many other pests). Bifen, Viper, Cyonara Lawn and Garden, Intice Perimeter 10 (“green”) and EcoPCO WP X (“green”) are a small sample of many products that are available. Generally, treating the perimeter involves spraying or spreading 3 to 10 feet out from your house in the mulched areas. If you are spraying apply plenty of water with the product to carry it down where the pests are hiding. Also spray about 3 feet up the side of your house, around windows, porches, garages, eaves, garbage areas and other areas where pests may be found. Read and follow label directions for the specifics of doing a perimeter treatment for the product you choose to use.
If searching for roach fecal pellets with a flashlight does not sound like fun to you, remember there are a bunch of Pest Management Professionals in the area that would love to do this inspection for you.
