Tuesday, September 6, 2011

Leatherjackets and control

Leatherjackets - larvae of Tipula

The crane fly larvae are about 4 inches long and look brown with a cylindrical body. They have no legs and they occur in the early autumn under the ground.
When leatherjackets largely present in the lawn will be clear to see bald spots. It is often said that the leatherjackets the roots of grasses eaten piece, but actually they feed on the green of the grass. They pull the grass down to where there is credit to do so.

The most common are the larvae of Tipula oleracea leatherjackets and Tipula paludosa. The difference between these two types of crane flies is in the number of antenna particles. Tipula oleracea has the 13, Tipula paludosa has the 14. In addition, the Tipula paludosa fly later in the fall then soorgenoot in late August to early September has flown.
Another important difference between the two species is that T. paludosa only one generation per year, which brings forth from late fall until May harm. The T. oleracea has two generations per year. The first generation will mainly damage in the summer, while the other generation, like T. paludosa from autumn until May dominates the lawn.
Besides these two, there are over 1000 species worldwide. In the Benelux there are about 50 different species.

Leatherjackets are not very deep in the lawn, they usually spend 2 to 3 inches below the turf. At night they crawled halfway out of the ground and they begin to eat the green. On rainy days they can also move above the ground when they are looking for food.
If you hope that the prince will eliminate the leatherjackets you're in for trouble. Leatherjackets are not frost sensitive larvae that are also (at moderate temperatures) during winter will further their destructive food tours.
Besides grass, they will be found in lawns with flowers and young plants in the vegetable garden.

Emeltenplaag recognize
To check for leatherjackets present the lawn covered with dark plastic. Do this if it rains when leatherjackets active. The dark plastic, they remain on the grass. When you remove the plastic leatherjackets are visible.

Leatherjackets fight
Leatherjackets can be combated by the use of nematodes (also called nematodes). Nematodes are parasitic insects that will invade leatherjackets and there will be a bacteria which secrete leatherjackets eventually die. From there starts a new generation of nematodes towards other leatherjackets. When no longer sit leatherjackets these nematodes die eventually.
And another quick method to combat leatherjackets the use of chemical pesticides such Pychlorex.
The best time to leatherjackets to fight in the autumn mid-September, provided that the soil temperature is not less than 8 degrees.