Warning for Growers over Blossom Midge Numbers

The News Letter (Belfast, Northern Ireland), May 25, 2002 | Go to article overview
Save to active project

Warning for Growers over Blossom Midge Numbers


It's likely to be a bad year for Wheat Blossom midge, according to preliminary Pestwatch information collected jointly by ADAS and Dow AgroSciences.

Analysis of last year's harvest samples revealed that more than 50% of grain suffered attack from Wheat Blossom midge larvae. Such a high level of damage indicates a significantly increased risk this season, experts warn.

As ADAS' Jon Oakley explains, "The numbers of overwintered larvae are now so high that serious damage is likely to occur whenever suitable hatching conditions coincide with ear emergence.

"Assume that each damaged grain was caused by just one larvae. With 40 grain sites per ear and 500-600 ears per square metre, we could be looking at between 100 and 120 million larvae per hectare in the worst- affected regions.

"Economic threshold levels for treatment are just one million per hectare," he points out.

Soil temperatures rising above 13C during late May, combined with sufficient rainfall to wet the top 10mm of soil promote Wheat Blossom midge development. In June, temperatures must stay above 15C just before dusk.

Mr Oakley stresses that advice, issued in previous years, to use wind speed as another indicative factor may no longer be relevant. "Numbers in many areas are now so high that this is probably now no longer a critical factor, except for flights between fields."

ADAS and Dow AgroSciences are working together on the Pestwatch system, which collates data from soil sampling of cocoons to produce a likely pattern of hatching and emergence.

The rest of this article is only available to active members of Questia

Sign up now for a free, 1-day trial and receive full access to:

  • Questia's entire collection
  • Automatic bibliography creation
  • More helpful research tools like notes, citations, and highlights
  • Ad-free environment

Already a member? Log in now.

Notes for this article

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
Loading One moment ...
Project items
Notes
Cite this article

Cited article

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited article

Warning for Growers over Blossom Midge Numbers
Settings

Settings

Typeface
Text size Smaller Larger
Search within

Search within this article

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

While we understand printed pages are helpful to our users, this limitation is necessary to help protect our publishers' copyrighted material and prevent its unlawful distribution. We are sorry for any inconvenience.
Full screen

matching results for page

Cited passage

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited passage

Welcome to the new Questia Reader

The Questia Reader has been updated to provide you with an even better online reading experience.  It is now 100% Responsive, which means you can read our books and articles on any sized device you wish.  All of your favorite tools like notes, highlights, and citations are still here, but the way you select text has been updated to be easier to use, especially on touchscreen devices.  Here's how:

1. Click or tap the first word you want to select.
2. Click or tap the last word you want to select.

OK, got it!

Thanks for trying Questia!

Please continue trying out our research tools, but please note, full functionality is available only to our active members.

Your work will be lost once you leave this Web page.

For full access in an ad-free environment, sign up now for a FREE, 1-day trial.

Already a member? Log in now.

Are you sure you want to delete this highlight?