Small aphelinid hymenoptera, is a species that mainly parasitizes the white fly neanids of greenhouses , on horticultural and ornamental plants .
The adult insect measures 0, $ 1mm; there is sexual dimorphism in fact the females have head and dark thorax, and the bright yellow abdomen; males differ in the color of the abdomen that is brownish. The adulata feeds on honeydew or biological fluids of parasitized hosts, many nymphs are in fact killed by females for the sole purpose of obtaining nourishment.
The eggs are laid in the nests of the host (preferably of advanced age), which take on a characteristic brownish color. The larva that is born, develops within the ellipsoid and ends the cycle, in fact a new adult will emerge from the pupario of the host practicing a characteristic circular hole. The female of this parasitoid lays about 50 eggs in as many guests. This aphelinide has been introduced in Europe from North America for the biological control of greenhouse whitefly; currently it is bred in many European biofabric and its use is well established.
It is introduced on the culture at the pupa stage next to the flicker (pupario). The species is now well acclimatized in countries with a temperate climate; in fact it fears the winter cold and therefore it must be repopulated for the applications in open field. Its greatest use concerns protected crops, at the first appearances of the plant we make 4-6 shots of 4-6 pupars per square meter at a rate of 15 days in spring and about 7 days in summer.
The aim is to achieve a level of parasitization of 60-70%. Encarsia Formosa presents itself as an insect ideal for biological control because: it has a high reproductive potential, the population is generally composed of parthenogenetic females (males rarely appear), has a high hunting attitude.
Encarsia formosa controlla:
Viene introdotto sulla coltura allo stadio di pupa prossima allo sfarfallamento( pupario). La specie è ormai ben acclimatata nei Paesi a clima temperato; difatti teme il freddo invernale e pertanto si deve fare il ripopolamento per le applicazioni in pieno campo. Il suo impiego maggiore riguarda le colture protette, alle prime apparizioni del fitofago si effettuano 4-6 lanci di 4-6 pupari per mq a cadenza di 15gg in primavera e di circa 7gg in estate.
Lo scopo è quello di ottenere un livello di parassitizzazione del 60-70%. L’Encarsia formosa si presenta come un insetto ideale per la lotta biologica in quanto: possiede un alto potenziale riproduttivo, la popolazione è generalmente costituita da femmine partenogenetiche ( raramente compaiono i maschi), ha un’ elevata attitudine alla caccia.
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