27 March 2015 | Online since 2003



14 January 2013|Arable,Cereal,Crops,News

Start of wheat bulb fly egg hatch reported


Even though the latest HGCA Wheat Bulb fly survey indicated that only 3% of sites samples were above the threshold of 250 eggs/m², many late drilled crops could still be at risk if they have only one or two tillers at the time Wheat Bulb fly egg-hatch has started.

Egg-hatch for Wheat Bulb fly has already started in Suffolk, Cambridgeshire and Hertfordshire.

The low egg counts in the autumn indicated that Wheat Bulb fly would pose a limited threat to crops sown before November. However the wet autumn delayed drilling and plant development.

Consequently many autumn crops were sown late and for these a lower threshold of 100 Wheat Bulb fly eggs/m² will apply.

In the East of England 47% of monitored sites were above this level and in the North 27%. Later sown crops with just one or two tillers at egg hatch time may benefit from an insecticide treatment, even if egg numbers are in the moderate infestation category (100-250 eggs/m²).

This is particularly so as most later drilled crops will not have had a seed treatment as late drilling was not anticipated.

Slow developing early drilled crops will also need to be monitored and an egg-hatch spray may be worthwhile if these crops have low tiller numbers and Wheat Bulb fly egg numbers are in the moderate infestation category.

Sarah Hurry of Dow AgroSciences urges growers to assess the risk on their own farms and to identify vulnerable fields that may need treatment with Dursban WG (chlorpyrifos).

"Risk is based on locality, previous cropping, drilling date, plant population, tillering and soil type. Late drilled, struggling, backward or thin crops, of which there are many this year, may well benefit from Dursban WG at the first available opportunity in order to promote tiller survival."

"Dursban is an effective soil insecticide and should be applied at egg-hatch at 1 kg/ha in 200-1000 litres of water. It remains active in the soil for at least six weeks, meaning that most larvae will be controlled as they hatch over a longer period of time. If necessary Dursban WG can be applied to frosty ground but should not be tank mixed," says Sarah.

Growers are being advised to take all precautions to prevent drift by using low drift nozzles and an extended buffer zone when applying Dursban WG.

A new "risk assessment" for chlorpyrifos, under its routine EU/UK review, means that the existing label no-spray buffer zones adjacent to watercourses are no longer considered sufficient protection for aquatic organisms by the CRD.

An industry Stewardship initiative – Say NO to drift!- is in place. The aim of this campaign is to protect future availability and use of insecticides containing chlorpyrifos.

"When spraying Dursban WG for Wheat Bulb fly growers must use a LERAP rated 3 star nozzle and adopt a 20 metre buffer zone near to watercourses or a 1 metre near to dry ditches," says Dilwyn Harris from Dow AgroSciences.

Dursban WG (75% w/w chlorpyrifos formulated as a Water Dispersible Granule) is recommended for the control of Wheat Bulb fly as well as Leatherjackets, Frit fly and Wheat Blossom Midge. Two applications at dose rates of 1 kg/ha maybe applied up until flag leaf sheath extending (GS 39). It is packed in a 1 kg pack.

Download



Comments


No comments posted yet. Be the first to post a comment

To post comment without approval login or register

Display name

Please enter your name

Email (optional)
Comment

Please enter your comment

Post Comment

Your comment submitted successfully.Please wait for admin approval.

Some error on your process.Please try one more time.



Jobs


19 March 2015
Grain Planner
An interest or background in farming and agriculture would be useful but full training will provided for the right candidate....

25 March 2015
Buying Manager - Chilled and Frozen Food, Dublin
The range which includes dairy, bakery and fruit and vegetables will necessitate a pragmatic approach to ensure that our clie...

13 March 2015
Account Manager
We offer one of the industry’s most innovative portfolios, spanning products for the prevention, treatment and control of dis...

12 March 2015
Operations Manager - Minsterley
In this role your key responsibilities will be: - Managing day to day activities, ensuring the smooth running of business ope...

9 March 2015
Full Time Assistant Cafe Supervisor
To assist our supervisor with the day to day running of the busy farm cafe and to be in charge of the running of the cafe whe...




Top stories you may have missed
23 March 2015 | Cattle

UK butchers face difficulties to recruit...

Butchers in the UK are losing a generation through lack of training opportu...


20 March 2015 | Arable

Dust - the secret fertiliser?

NASA research has revealed how dust blown from the Sahara desert helps supp...


19 March 2015 | Arable

The Budget 2015: A Farmer's Budget?

“In the run up to the Budget 2015 most commentators were predicting that th...


17 March 2015 | News

UK's first floating solar power system l...

The UK’s first fully operational floating solar panel system has been unvei...


13 March 2015 | Animal Health

Labour and Conservatives clash over badg...

Axing the badger cull in England and Wales will save more than £120 million...


12 March 2015 | News

Solar could be cheapest energy source by...

By 2025, solar power could become one of the cheapest forms of energy in ma...


11 March 2015 | Finance

English buyers turn their attention to S...

Demand for Scottish farm land remains strong and continues to be better val...


9 March 2015 | Cattle

2020 vision for the Welsh red meat indus...

The Welsh red meat industry should aim to increase sales by at least 34 per...


6 March 2015 | News

MP raises egg industry concerns on trans...

Fears about the impact that a proposed transatlantic trade agreement could ...


Stay safe and legal when flying drones

The use of Unmanned Aerial Vehicles and Unmanned Aircraft Systems - or dron...