Horse chestnut leaf miner pheromone

How to use pheromone to capture the horse chestnut leaf miner?

To capture the horse chestnut leaf miner, you must first get a pheromone trap of your choice. This will allow you to trap the male horse chestnut leaf miner in the trap in order to limit reproduction and therefore damage. Trapping (or monitoring) makes it possible to know when flights occur, so you can treat your horse chestnut trees at the right time in view of future attacks.

Cameraria ohridella (horse chestnut leaf miner)

Host plants

La mineuse du marronnier (Cameraria ohridella) est un insecte ravageur exotique qui vit dans les marronniers. Ses larves (chenilles) minent les feuilles et, à forte densité de population, elles peuvent détruire la plupart des tissus foliaires. Bien qu'il puisse causer de graves dommages aux feuilles de marronnier chaque année, ainsi que la décoloration et la défoliation avant la chute automnale normale des feuilles, le ravageur ne nuit pas de manière significative à la santé des arbres.

Biology

The larva creates a small cavity (or mine) parallel to a vein in the leaf and removes sap rather than feeding on the tissues. At the third stage, the larva creates a mine about 8 mm in diameter; this is further expanded by subsequent instars until a mine can cover several square centimeters. The larva begins to pupate about four weeks after the eggs hatch and, except when it overwinters as a pupa in the mine, the adult emerges about two weeks later. In severe infestations, individual mines can merge and almost the entire surface of the leaves can be used

Damage and identification

The larvae, as in most Gracillariidae, are leaf miners; their reddish-brown galleries are, however, very easy to spot. They cause browning of the leaves that can lead to premature leaf drop in summer and the appearance of new leaves in autumn during heavy attacks.

Pheromone trap

The most suitable trap for the horse chestnut leaf miner is the Funnel trap. Please note: for this pest, the assembly is slightly different:

What to do in the event of trapping?

From the first captures of horse chestnut leaf miners, use a multipurpose natural insecticide (to destroy eggs and larvae), or an insecticide with Bacillus thuringiensis as soon as caterpillars are present (3 weeks after the first captures).

Photos of Cameraria ohridella

The horse chestnut leaf miner larva

Visible damage on the leaves

How many pheromone traps do I need to set up?

• Place 1 to 2 pheromone traps per horse chestnut tree depending on its size
• Put 1 pheromone lure per trap, replace every 4 to 5 weeks.

When to use the horse chestnut leaf miner pheromone Maluttebio?

J F M A M J J A S O N DIdealPossible

Optimal period of use : April to September