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Table 1 Uptake of [ 32 P] phosphorous acid into Pinus radiata needles with or without various adjuvants at 24 hours after treatment (HAT) and droplet spread on needle surface

From: The use of adjuvants to improve uptake of phosphorous acid applied to Pinus radiata needles for control of foliar Phytophthora diseases

Treatment no

Rate of active (kg ha-1)

Adjuvant

Adjuvant concentration

[32P] uptake (%)

[32P] uptake dose* (kg ha-1)

Spread area of droplets (mm2)

1

3

None

-

6.6 cd

0.20

0.8 h

2

12

None

-

3.9 d

0.47

1.0 g

3

12

Pinolene

0.35

6.8 cd

0.82

1.2 f

4

12

Alcohol ethoxylate

0.05

7.7 cd

0.92

1.5 e

5

12

Alcohol ethoxylate

0.10

18.6 b

2.23

1.7 d

6

12

Alcohol ethoxylate

0.20

14.2 bc

1.70

2.0 c

7

12

Organosilicone penetrant

0.20

20.1 b

2.41

2.3 b

8

12

Organosilicone blend

0.20

36.9 a

4.43

2.7 a

  1. Means within columns sharing common postscripts are not significantly different.
  2. *Nominal dose calculated as (phosphorous acid rate x %_uptake).
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