Seed
Dressings.
Seed-borne pathogens pose a threat to establishment and development
of a profitable crop. Seed-borne diseases can affect seedling
establishment or they can be transmitted from seed to seedling.
Seedlings and young plants are put at further risk by soil-borne
disease and soil pests. Protection of seeds and young seedlings
is the primary objective of seed treatment.
Seed treatments may also provide additional benefits over and
above seed and soil-borne disease and pest control. These include
early season foliar disease control, additional pest control
and plant growth regulatory effects.
Oilseed rape fungicides available for seed dressings include
Thiram (Damping off) and iprodione (Alternaria). These are supplemented
with the addition of an insecticide. Since the withdrawal of
Gamma-HCH in 1999 oilseed rape growers have had to rely on multiple
applications of pyrethroid insecticide sprays to control flea
beetle and aphids that spread Beet Western Yellow Virus. Chinook
from Bayer CropScience has now filled this gap and has allowed
the addition of an insecticide to the seed dressing. Chinook
contains betacyfluthrin and imadacloprid, which controls early
flea beetle attack and aphids but has no detrimental effect
on non-target organisms.
DO NOT BROADCAST SEED TREATED WITH CHINOOK
New seed will come with Rovral + Thiram + Chinook.
Where you are home saving seed you have a choice depending on
your seed quality. If your crops are heavily laid, germination
will be of crucial importance as some fields may have high levels
of Alternaria and seeds suffering from pre-germination. Good
sampling will be very important and having this seed tested
at an experienced seed quality analysts such as NIAB is crucial.
NIAB
Limited
Huntingdon Road,
Cambridge CB3 0LE
Contact Dr.Jane Thomas
01223 342251
If your seed is of lower quality in seed size, weight and colour
you may be better off buying new seed..
On most crops Roval+Thiram+Chinook will offer good control of
Alternaria (Rovral) and flea beetle (Chinook) if you are home
saving.
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