RAPID ACCESS TO THE LATEST REGIONAL CROP PEST AND DISEASE LEVELS
Regional Crop Report South East, 11 May 2007
Winter Wheat
Comment on current growth stages
Field conditions
September
and early October sown crops now commonly range between GS 39-45 (Claire/Alchemy)
up to GS 52, early ear emergence for late September sown Xi19 and
Einstein. October sown crops of Einstein, Xi19 and Solstice now have
the flag-leaf 100% emerged and are booting. All crops of Soissons
drilled in October/November are now at GS 49-55, with some fields
likely to be flowering in next 5-7 days. Wheat crops are incredibly
short this year, barely knee height, even where only one PGR application
has been made, and frequently seem to have very small flag-leaves
- symptomatic of stress-induced growth and restricted N-uptake.
Still
fairly dry although we have recently had 8-10 mm of rain over past
few days with more forecast, however with soil moisture deficits of
100 mm, we need plenty more if crops are to withstand another hot
spell.
Main
diseases Present
Level
and comment
Brown
Rust
Still
very widespread on lower leaves of all September sown crops of Alchemy,
Claire and Solstice. T1 fungicides now mainly
applied.
Mildew
Still
very hard to find any active pustules.
Septoria
tritici
Lesions
very obvious on all older leaves of all September/early October sown
wheats - but very little evidence of Septoria in many crops from leaf
5 and above.
Yellow
Rust
So far under control from fungicides already applied.
Eyespot
Can
still be found in earlier sown second wheats and Solstice/Robigus
as first wheats.
Other
BYDV
- noticeable patches of severe virus showing in many mid-late September
sown wheat crops along high-risk coastal belt, despite use of Deter
and follow-up pyrethroid in November.
Main
Pest problems
Level
and comment
Aphids
None
seen.
Frit
fly
None
seen.
Leatherjacket
None
seen.
Opomyza
None
seen.
Slugs
None
seen.
Wheat
bulb fly
None
seen.
Wireworm
None
seen.
Other
None
seen.
Main
weed problems
Level
and comment
Blackgrass
No
further reports.
Meadow
grasses
Rye
grass
Bromes
Cleavers
Large
flush present in some crops at cotyledon to 2 whorls.
Most crops of Sequel/Pearl are now at GS 55 - 61, full ear emergence
and flowering.
Still fairly dry although we have recently had 8-10 mm of rain over past
few days with more forecast, however with soil moisture deficits of
100 mm, we need plenty more if crops are to withstand another hot
spell.
Most
crops have now finished flowering (except a few later sown crops)
and with a good pod set and hopefully a long pod-filling period sustained
by late N uptake and rain at last, yields should be respectable.
Still fairly dry although we have recently had 8-10 mm of rain over past
few days with more forecast, however with soil moisture deficits of
100 mm, we need plenty more if crops are to withstand another hot
spell.
Main
diseases Present
Level
and comment
Club
root
No
further reports.
Downy
Mildew
None
seen.
Light
Leaf Spot
None
seen.
Phoma
None
seen.
Powdery
Mildew
None
seen.
White
Leaf Spot
None
seen.
Other
Sclerotinia
continuing very dry weather and soil surfaces, coupled with very
little petal sticking, means that the risk of infection remains very
low.
All risk predictions published by CropMonitor are provided in good faith and are NOT a substitute for
rigorous fieldwalking in combination with advice from BASIS qualified persons. CropMonitor accepts no liability
for crop loss or damage resulting from the use of CropMonitor.
