The Box Tree Caterpillar moth trap catches male moths of Cydalima perspectalis . A new invasive species attacking box plants and hedging in the UK.
Box Tree Caterpillar Moth Pheromone Trap
Cydalima perspectalis is a moth from East Asia that is starting to appear in the UK, especially in the south east. The larvae or caterpillars of this moth feed on box plants [ Buxus ] . The moths lay pale yellow flat eggs that overlap each other in a flat sheet on the underside of leaves. The young larvae that hatch are greenish yellow with black heads. As the larvae/ caterpillars mature the green body develops dark brown stripes and very mature larvae have thick black and thin white stripes down the body with large black dots outlined in white. The caterpillars start at between 1.5 to 2.0 cm long and develop up to 4cm long. The moths have a wingspan of about 4cm . The body is mainly white with a brown head and white wings.
The Box tree caterpillars feed and eat the box leaves . This leaves the box plants disfigured with patches of what looks like dieback [ not to be confused with box blight ] caused by the severe loss of leaves. The caterpillars develop into pupae that wrap themselves in white webbing. In severe cases complete defoliation can occur.
There are several generations of Box tree caterpillars in a season from April-October. One method of monitoring and catching adult male moths is with the use of the Box Tree Caterpillar moth trap. This is a funnel trap with a specific pheromone lure to attract this species. The moths are attracted to the lure and then drop down into the funnel trap, which normally is filled with some water.
By catching males, mating and egg laying can be reduced and populations monitored for additional control measures.
Installation of traps:
- Take lure out of sachet and place in small cage holder in the top of the trap
- Add some water to the trap bucket and replace water on a regular basis
- The funnel trap has a clear bottom so catches and water levels can be observed
- Hang the trap on a pole/cane/stick close to the vulnerable plants, place in an open area so that moths can easily be attracted to fly in
- Each pheromone lure will last 5-6 weeks and should be replaced
Further control measures will be needed if the caterpillars develop. Natural Pyrethrum sprays can be effective with good coverage, such as Pyrol. More than one application maybe required. There are some nematodes that can also be applied against caterpillars but the application can be difficult as the nematodes are UV sensitive and need moisture to penetrate the caterpillars. Please ask for our specialist advice on this, if you wish to try this form of biological pest control.
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