Thrips

Chemical Control

The use of pesticides is no longer recommended due to the increasing resistance and the concealed locations thrips most commonly inhabit within the plant making pesticide reach difficult.

Biorational Control

Biorational and organic means of thrips control are resulting in the most promising management of thrips in greenhouses. Use of sticky traps in conjunction with predatory mites have proved effective in bringing western flower thrips under control. This strategy has shown increased financial returns with the added benefit of reducing pesticide use. Each glasshouse has a diverse range of crops, microclimates and other ecological conditions that result in a unique ecosystem. As insects are living organisms they are very susceptible to slight environmental changes and so control strategies that work in one greenhouse may not work so well in another. In collaboration with various growers in different climates and industries, Russell IPM has developed 3 core products in the Optiroll range that are each suited to the array of environments most commonly found to host thrips species.

Optiroll Blue

In collaboration with Keele University, trials were conducted to determine the most attractive wavelength of colour for thrips capture. Western flower thrips were found to be most attracted to the wavelength labelled ‘Blue 4’ with varying degrees of attraction to other trap colours. Russell IPM now incorporate this particular wavelength of colour in each of its blue Optiroll products to ensure maximum trap catch.

Thrips can be hard to detect due to their small size and tendency for hiding in small and concealed parts of the plant. Symptoms of plant damage by thrips include: deformation of buds, shape distortion of fruits or vegetables during growth and a range of leaf spots and scars from thrips feeding. The larvae feed throughout the plant and leave the crop susceptible to secondary infection resulting in moulding and wilting.

Despite their small size of approximately 1mm in length the repercussions of Thrips infestations can be huge. 

 

Thrips have six main life stages which includes the egg, two larval, prepupal, pupal and adult stages. Eggs are laid on the underside of leaves, flower structures or fruit. In some cases this can result in wart-like growths but in others it is undetectable. 

Larvae mature through two instars in concealed and well-protected plant parts such as within flower petals or under the calyx of fruits. In heavy infestations the larval will become mobile as they attempt to nourish upon all parts of the plant that are above ground. Most thrips, including western flower thrips, fall to the ground in order to pupate.

Finally, the adult thrips will emerge with slender and fringed wings in order to take flight and seek a partner for reproduction.

 

Thrips have six main life stages which includes the egg, two larval, prepupal, pupal and adult stages. Eggs are laid on the underside of leaves, flower structures or fruit. In some cases this can result in wart-like growths but in others it is undetectable. 

Larvae mature through two instars in concealed and well-protected plant parts such as within flower petals or under the calyx of fruits. In heavy infestations the larval will become mobile as they attempt to nourish upon all parts of the plant that are above ground. Most thrips, including western flower thrips, fall to the ground in order to pupate.

Finally, the adult thrips will emerge with slender and fringed wings in order to take flight and seek a partner for reproduction.

 

We recommend OPTIROLL BLUE for getting rid of Thrips

The specific colour matrix of Optiroll Blue is highly attractive to Thrips. Optiroll Blue features a scientifically optimised colour matrix to maximise pest catch rate whilst reducing attraction to beneficial insects. It compliments biorational integrated pest management programmes such as those utilising predatory mites - to significantly enhance success rate. Optiroll Blue leaves 0% residue on fresh produce. Target Pest: Broad range of Thrips species including Western Flower Thrips, Frankliniella occidentalis.