Mating Disruption for Tuta absoluta

Isonet®T is a reservoir pheromone dispenser consisting of two parallel brown-red polymer tubes, one of which is filled with the Tuta absoluta natural pheromone blend [(E,Z,Z)-3,8,11-tetradecatrien-1-yl acetate and (E,Z,)-3,8-tetradecadien- 1-yl acetate], while the other one contains an aluminum wire and enables the positioning of the dispenser in the greenhouse.

This condition is achieved by applying a defined number of dispensers that continuously release the active ingredient. This release is based on physical-chemical principles and is related to the intrinsic dispenser polymer characteristics.

Isonet®T dispensers, even under varying temperatures, are specifically designed to allow a long-lasting release of Tuta absoluta pheromone. Mating disruption is based on the use of active substances called pheromones.

Pheromones are chemical messengers emitted by females to attract males from long distances in order to mate.

Mating disruption is accomplished by creating pheromone concentrations in the environment sufficient to hide the trails of calling females so that the males are not able any more to locate them.

As a result, mating is either prevented or delayed; consequently, the target pest population as well as crop damage is reduced.

Mating disruption should not be considered as a stand-alone control strategy alternative to chemical control. It should, instead, be used as a baseline control tool within the pest control program, which may vary depending on several factors, first of all the initial pest population density.

Greenhouses with low population density of Tuta absoluta may be adequately protected by mating disruption only. Under conditions of medium-high population density, instead, mating disruption should be used in combination with insecticide sprays.

Advantages of Isonet®T

  • High efficacy in numerous field trials carried out in Italy and Spain

  • Harmless to bumblebees

  • Allowed in Organic Farming

  • No Maximum Residue Level (MRL)

  • No pre-harvest interval (PHI)

  • Can be used in combination with biological and chemical control methods

Isonet®T Application

  • Apply dispensers a few days before tomato transplanting by lightly twisting them around the support wires inside the greenhouse; avoid twisting them too tightly

  • Evenly distribute the dispensers inside the greenhouse

  • Apply additional dispensers as reinforcement along the borders and at the beginning/end of the rows

  • Check the sanitary conditions of the seedlings coming from the nursery and, if deemed necessary, apply an insecticide spray right after transplanting to reduce pest presence

  • Plan one or two Isonet® T applications depending on the tomato transplanting period (winter or summer) and the length of the crop cycle

  • Seal the greenhouse with insect-proof net in order to prevent migration of mated females from the outside inside the greenhouse

  • Periodically assess the infestation level on leaves and fruits in order to establish whether an additional insecticide application is necessary

  • Destroy crop residues and eliminate wild Solanaceae growing inside and in the immediate surroundings of the greenhouse