TOxICOLOGICAL PROPeRTIeS - Bayer CropScience

Foliar fertilisers
Glasshouse pot trials in Western Australia by Robson
and Snowball (1989) demonstrated soil-incorporated
diclofop-methyl (a key component of Cheetah Gold)
could induce zinc deficiency in wheat.
Graph 9. Wild oat control with Cheetah Gold plus foliar zinc fertiliser
% wild oat control
100
95
90
85
80
75
70
Cheetah Gold
1 L/ha + Uptake 0.5% v/v
Trial ID: 05ND11, 05ND12, 05VA16, 05VA17, 05VB07, 05SA15
Cheetah Gold 1 L/ha
+ Uptake 0.5% v/v
+ Twin Zinc 350 mL/ha
Trials indicate that the addition of zinc oxide to Cheetah
Gold has a negative impact on wildoat control, as shown
by the graph below.
No information is available on mixtures with other foliar
fertilisers, and therefore cannot be recommended.
Cheetah Gold 1 L/ha
+ Hasten 1% v/v
Cheetah Gold 1 L/ha
+ Hasten 1% v/v
+ Twin Zinc 350 mL/ha
Annual ryegrass control is affected less than wild oats if foliar zinc is added to Cheetah Gold.
Graph 10. Annual ryegrass control with Cheetah Gold plus foliar zinc fertiliser
% annual ryegrass control
100
95
90
85
80
75
70
Cheetah Gold
1 L/ha + Uptake 0.5% v/v
Trial ID: 05NW16, 05NW17, 05VA16, 05VA17
NB. VA16 and VA17 low levels of Group A resistance developing.
Cheetah Gold 1 L/ha
+ Uptake 0.5% v/v
+ Twin Zinc 350 mL/ha
Cheetah Gold 1 L/ha
+ Hasten 1% v/v
Cheetah Gold 1 L/ha
+ Hasten 1% v/v
+ Twin Zinc 350 mL/ha
Highest
result
Average
result
Lowest
result
Highest
result
Average
result
Lowest
result
CROP SAFETY
Crop discolouration and biomass reductions
Cheetah Gold can cause crop discolouration shortly
after application. The typical symptoms include
yellowing of the plant material. Diclofop-methyl
penetrates the cuticle and epidermis rapidly, but
translocation in the phloem is relatively slow. Movement
in the xylem is more rapid, leading to an accumulation
of active ingredient at the leaf tips. This can result in
burning of the wheat and barley leaf tips. Transient
Graph 11. Maximum crop discolouration in wheat trials – Cheetah Gold 1 L/ha
% maximum crop discolouration
in wheat trials
% maximum crop discolouration
in barley trials
30
25
20
15
10
5
0
30
25
20
15
10
5
0
06ND08
06ND06
05WA16
06ND10
05ND12
06ND19
06ND09
05ND09
06NW13
06ND17
05ND11
05SA12
05WA15
05VB07
06NW17
04WB13
04ND01
06SA55
05VA16
05WA12
04ND23
06WB08
06NW14
06ND11
05NW15
05SA15
05NW16
05WB07
05WB06
04SA44
04SA43
05WA14
04WA10
04VB12
06ND18
04VB09
06NW15
06ND07
04VB11
05NW17
05WA17
05WB05
06NW11
06VB06
Adjuvant Hasten 1% v/v or Uptake 0.5% v/v
04QG10
04QG08
05ND08
05ND10
05SA14
05SA11
ND32/05
04WA11
05WB17
05WB27
06ND20
06NW08
04SA44
Trial ID
Graph 12. Maximum crop discolouration in barley trials – Cheetah Gold 1 L/ha
04ND23
06WA14
06SA55
whitening at the base of new leaf emergence may occur,
affecting new growth.
Under cold, wet, waterlogged conditions or nutrient
stress, these crop effects can be severe. Older leaves
turn yellow and there is significant necrosis. New
growth is unaffected and the crop recovers in
about 4 weeks. In some cases new growth may show
transient whitening and growth may be slowed. The
maximum effect is 21–28 days after application, with
recovery being 40–60 days after application. Where
plants have been double-sprayed through overlap,
effects may remain noticeable up to harvest.
SA42/05
04VB09
05VA14
05VA15
05VB06
05VA17
05NW15
05WB28
ND31/05
04ND21
06WA15
06QC08
Adjuvant Hasten 1% v/v or Uptake 0.5% v/v
Trial ID
12 13