Controlling the spread of light-brown apple moth
The warning comes from FAST adviser Rob Cook, who explains that once present the moth is impossible to eradicate. "For soft and tree fruit growers they are very problematic, so keeping on top of numbers is imperative," he advises.
"Over the last three or four years their spread has been rapid, culminating in a widespread UK presence. They are a very polyphagous species – they’ll eat anything," explains Rob.
"The larvae construct harbourages – rolling together leaves, buds, shoots and fruit clusters producing a webbing, eating immature fruits before later burrowing and hollowing out the berries. Hidden away they can be very difficult targets.
"There are so few approved insecticides available against the moth – even fewer approved for use on blueberries," explains Rob. "Dimilin Flo (diflubenzuron) is one of the few options effective against the pest and approved for use on blueberries under a specific off-label approval.
He advises monitoring to assess the treatment threshold. "Pheromone traps are increasingly being used to monitor populations. Once counts increase at a rate of ten moths per week then treatments should be introduced," he recommends.
Close regular monitoring is critical, urges Rob. "Populations can explode in a short period of time, with counts one week going from one or two per week to over 60 per trap the next," he warns.
"Our control programmes incorporate two applications of Dimilin, coinciding with each of the moths two generations. The first treatment after bloom has finished, depending on counts, and a second after harvest to reduce any surviving populations able to over winter.
Certis advise that within a planned approach Dimilin Flo is the preferred option but where caterpillars become established a quick pest knock down can be achieved using Spruzit (containing pyrethrins and oils).
No comments posted yet. Be the first to post a comment
Please enter your name
Please enter your comment
Your comment submitted successfully.Please wait for admin approval.
Some error on your process.Please try one more time.
The permanent eradication of Bovine Viral Diarrhoea [BVD] in Scottish cattl...
The abolition of milk quotas in Europe on 1st April has resulted in a numbe...
The top 14 milk producing countries in Europe will increase their productio...
Matt Ware is the NFU's head of government and parliamentary affairs, based ...
There is a 'desperate need' to improve farmgate returns given low incomes a...
Rapid stem extension, after a slow start to spring, is likely to create spl...
The time has come for landlords to expect to see reductions in farm rents, ...
Cogent’s reputation as a source of the highest calibre sires has been enhan...
The spread of exotic and aggressive strains of a plant fungus is presenting...