Stone and perenocarp fruit
Controlling codling moths and flat-headed root borers using nematodes
Many pests can no longer be controlled using standard plant protection agents. This might be because it would affect other beneficial insects or that the pests are already resistant to the agent used – problems which do not arise when using beneficial insects.
Codling moth larvae are one of the most important insect pests for apples and peas. Their larvae are the natural host of the species Steinernema carpocapsae and are herefore vulnerable to nematodes. The only issue is bringing the nematodes and larvae together. This is best done in the autumn when larvae conceal themselves under the fruit skin. This is where nematodes also like to be and can kill the majority of the larvae within a few hours. In doing so, this reduces egg laying in spring by around 50%. Advisors recommend treatment using nemapom® if the harvest infestation exceeds 1%.
nemapom® contains Steinernema feltiae nematodes and is effective at temperatures above 8 °C. The perfect application window is September and October. Usually, the entire tree needs to be treated. The trees should be wet during application and should stay wet overnight. Rain, drizzle, mist or dew increase effectiveness following application. The temperature must be 8°C or higher for a few hours after application. Temporary drops in temperature, such as during the night, do not impair treatment. nemapom® is also effective against the plum fruit moth.
Apply 1.5 billion per hectare for treating entire trees. Apply as much water as possible (at least 1,500 litres/hectare). Addition of a wetting agent may improve effectiveness. nemapom® can be stored in the refrigerator for at least 6 weeks without affecting quality.
The flat-headed root borer (Capnodis tenebrionis) can be found on fruit trees, especially in apricot, cherry, plum, almond and cherry plantations, in early summer. Larvae hatch from the eggs and bore into the roots. Once in the roots, they make their way to the stem. It takes just to larvae to kill a fruit tree.
Depending on the size of the tree, only 2-4 million nematodes per tree are required to control the pest successfully. The addition of a special chitosan has also proven worthwhile as well as two treatments per year (spring and autumn). Nematodes can be applied either through watering or by using a sprinkling system.