|
Technical Note: Roundup Formulations and Seed Crops
No glyphosate- containing herbicide, including all Roundup
formulations, is Approved for use on ANY seed crop
July, 2004
Notes Of Explanation:
- If a crop is sprayed with glyphosate when it is still immature there may be
translocation into the seed and subsequent germination will be affected. However,
the correct timing is after 30% moisture has been reached in the grain or seed. At
this point the movement of plant foods to the seed has ceased and no glyphosate will
be translocated into the seed.
- In a cereal crop whose ripening is relatively even, the application is be made when
all the seed is mature and less than 30% moisture. Spraying earlier will stop further
grain fill, leading to shrivelled grain and increasing the risk of residues of
glyphosate in the grain. Providing the timing recommendations are adhered to
Roundup products may be applied to all crops used for feed, wheat and oats
intended for milling and barley and wheat intended for malt for brewing and
distilling.
- Malting barley grains germinate as part of the malting process and it is particularly
important to be sure the moisture content is below 30% to preserve the viability of
the seed. So long as this timing is followed there will be no effect on the malting
potential.
- Crops which have indeterminate flowering have non-uniform maturation of the seed.
Timing for pre-harvest treatment of peas, beans, linseed, oilseed rape etc. is always a
compromise and to avoid the more mature seed being over-ripe application usually
takes place when a proportion of the seed is still immature i.e. average seed moisture
content is 30% or less. Hence germination of at least some part of any retained seed
crop will be affected. Seed which has taken up glyphosate may produce a shoot,
(from seed reserves) and pass a germination test, but still be affected once it reaches
cotyledon stage and starts to photosynthesise, mobilising the glyphosate. Thus, even
after adjusting seed rates, crop stunting and failure is possible.
Monsanto cannot back the use of Roundup products on ANY seed crops
Monsanto cannot back the use of Roundup products on ANY seed crops
|
