Controlling potato beetles with Bt

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Problem
Potato beetles can develop rapidly, especially in warm summers on late-maturing crops, causing extensive damage to the potato plants.
Solution
In the case of a large infestation, direct control measures e.g. the use of biological plant protection products like Novodor are justified. Novodor contains a bacterium; Bacillus thuringuensis tenebrionis (Bt), whose toxins (protein crystals) destroy the intestinal tract of potato beetle larvae.
Description
Check the state of infestation • When the potato plants start to emerge, walk the field every 7 days in a straight line and check plants at regular intervals. • If clusters of eggs are found on more than every third plant, apply Novodor four days after discovering the first clusters. Apply the agent • Dissolve 5 l of Novodor in 500 l of water per hectare of potatoes. • Novodor can be applied together with copper products. Optimal conditions: • The potato beetles are still in an early larval stage (L1 to L2). • Temperature between 15 °C and 25 °C. • Avoid direct sunlight: spray late in the evening or when the sky is overcast. • No rain is due within 8 hours after spraying. Comments • After a successful treatment, the larvae will turn black after a few days. • If the effect is insufficient, the larvae will stay mobile. In this case, the treatment should be repeated within the following 10 days.
Applicability
Theme
Pest and disease control
Languages
English, German language


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