Carpocapsa: biological struggle, effective remedies and insecticides recommended by agronomists. How do you get rid of thecarpocapsa of apple and pear trees.
Its scientific name isCydia pomonella. It is a small butterfly (a moth) very harmful to fruit growers: it attacks trees ofpear and apple tree. The female of Cydia pomonella lays her eggs in the fruit. The eggs, once hatched, give life to the development ofworms(larvae) that feed on the fruit.
The worms (Cydia larvae) dig tunnels to the area where the seeds are present. The affected fruit does not bear the signs of egg laying but has holes produced by the developing larvae.
If in the garden you collectpears and apples with worms, the culprit could be this parasitic insect.
Cydia pomonella or Carpocapsa
The larvae of Cydia pomonella are whitish in color with a dark head. They become yellowish during growth until they turn red. Thereadult carpocapsait is, on the other hand, a small butterfly. The wings have transversal bronze streaks.
The larvae ofcarpocapsathey damage the fruit, they dig tunnels which they fill with excrement. The larvae live in apples or pears until terminal development and adulthood.
Because of the damage, you won't just end up with pears and apples with worms, but also fallen fruit: the fruit detaches prematurely from the tree.
This parasitic insect can infest many fruit trees and attack:
The most sensitive varieties are theApple treeStaiman Red and Red Chief, and theHoweverAbbot Fètel and Kaiser. However, the Decana variety and Pacham's Triumph are less prone to damage than Cydia pomonella.
Carpocapsa: biological fight
Theintegrated struggleperforming, first, monitoring using pheromone traps to determine the density of adult males and apply adequate means of defense.
Inbiological strugglepreparations based on a virus, Cydia pomonella GV, are spreading and a practice of "sexual disorientation" is being used to avoid mating. Disorientation is accomplished by using pheromones. THE pheromones they are widely used in agriculture in biological control. For more information: pheromones in agriculture.
There microbiological fightit is carried out using the Beauveria bassiana mushroom.
Many of theinsecticidesused in the past foreliminate the carpocapsathey are now "banned" and used only in case of particular exemptions (insecticides such as Fenitrothion, Chlorpyrifos-ethyl...).
Theinsecticides, today, they are used as a supplement to thebiological struggle. Treatments with different active ingredients allowed in the integrated production regulations are possible. It is useless to perform treatments with the active ingredient "pyrethrum" as they are effective only in contact with the parasite.
Spinosad shows some effectiveness. This product is diluted in water and applied with a spray dispenser: it should be used before the appearance of insects, repeating the treatment after 15 days (2 treatments).
Effective remedies against Cydia pomonella
Betweenremediesmost effective we are not talking aboutinsecticidesorbiological struggle but of remediesmechanical.A French research found that in order to be fertilized by males, the female cougarhe must first attend the so-called "wedding flight".
For many animals, the courtship ritual is essential. There are those who show their tails and those who dance. The females of carpocapsa perform a vertical nuptial flight and if they fail to complete it they will end up laying sterile eggsand sono worms in pears and apples!
To prevent this nuptial flight, it is possible to usenets for the fight against carpocapsaand other parasitic insects of the apple and pear tree.
This French research has highlighted an important discovery that illuminated the world ofbiological agriculture. Initially, in fact, the adoption of nets was first "tested" among organic fruit growers and then spread to all producers, including those who grow pears and apples using the traditional method. In short, the networks for thefight against cydia pomonellawould also be preferred to theinsecticidesconventional.
The networks for thefight against carpocapsathey should have a 2 × 5 mm mesh. They can be installed as one-piece or single-row, as long as the mesh touches the ground.