What method of control against the grape berry moth?
• 1st generation
An intervention is usually unnecessary. A curative treatment may be considered at the threshold of 100 glomerules by 100 grapes.
• 2nd generation and next
The control is preventive.
It is necessary to prevent penetration of grapes because of the risk of rot. Two strategies are possible:
• Ovicidal treatment
With a product like “insect growth regulator" at the beginning of the control (detected by an increase in catches by sexual trapping) and before the first spawning. The IGR has a role on the larvae, but also on the eggs by disrupting their development. The treatment is selective and directed towards the grapes before the egg laying
.
• Larvicide treatment
With insecticide to position just before the first outbreaks in black head stage (9-11 days after the start of the second generation flight, 7-9 days after the flight on 3rd generation)
• Bio-insecticides
These are preparations based on Bacillus thuringiensis. This bacteria is specific for Lepidoptera. It produces toxins causing damage to the gut, and larvae die within 48 hours. Two treatments must be made 10 days apart. The first application is to be placed before the outbreaks. We must renew these products after 20 mm of rain combined.
• Pheromone
This technique aims to prevent mating between males and females. 8 ha are required to homogeneous deposit dispensers (500/ha). These disrupters will saturate the air in sex pheromones (natural substance emitted by the female to attract the male). This technique requires a rigorous implementation.
What method of control against berry moth?
The following thresholds are indicative and the reasoning of the struggle is different in different regions. In general, flight monitoring allows you to know when to treat.
• if fewer than 10 moths in 10 days, no treatment is necessary
• if more than 10 butterfly: In the first generation, where more than 100 glomerules/100 grapes, a curative treatment using a larvicide product is useful. In the second and third generations, treatment thresholds are within one grape attacked if there’s grey mould, and 10 grapes if there’s not grey mould. The control may be preventive following the previous generation’s damages, and following the flight dates
You can find all these technical sheets on:
