15 July 2009 INFLUENCE OF PHC SEED AND FOLIAR TREATMENTS ON IRISH POTATO GROWTH AND YIELD Summary of Rhizoctonia Data, Holland Ag Services, Washington

15 July 2009

INFLUENCE OF PHC SEED AND FOLIAR TREATMENTS ON IRISH POTATO GROWTH AND YIELD

Summary of Rhizoctonia Data, Holland Ag Services, Washington

Protocol: PT-01-09 & PT-02-09

Treatments (6):• Myconate® ST at 63(“.5X”), 126(“1X”), & 256(“2X”) ml /ton of seed• Employ ® at 2.1 oz/acre with 2 or 3 foliar applications• Myconate ® ST at 126 ml/ton plus Employ ® with 3 foliar applications

Protocol Locations: WA(4)

Application Method: • Myconate ® ST - Mixed with water and sprayed on seed pieces• Employ ® - Foliar applied in 50 gpa

Replications: 4 trial results treated as replicates

Data Requested:

At 28 days after emergence: Stand, Plant Height, Stem Count

At each harvest: /plot weight by grade, /acre yield, & quality

Disease incidence, if appropriate



Myconate and Employ are Registered Trademarks of Plant Health Care, Inc

Data Audit



• This is a summary of 4 trials conducted in WA in 2009. At each location, 20 stems from each entry (not each rep) were rated for severity of Rhizoctonia and placed into 1 of 4 classes – none, slight, moderate or severe.

• The results from each location were treated as replicates in a 4-replicate trial, and analyzed using Duncan’s New Multiple Range Test, P = 0.05. This does not give an estimate of the loc*treatment effect.

• Bartlett’s test for homogeneity identified no heterogeneous data.

• Grubb’s Test for Outliers identified no outliers.

Trial Results – Suppression of Rhizoctonia

Summary of 4 trials. Myconate ST applied to seed pieces at 63 (.5X), 126(1X) or 256(2X) ml/ton of seed; Employ applied at 2.1 oz/A at end of set and 3 weeks after (X2) or 3 & 6 weeks after (X3); Both = Myconate ST 1X and Employ (X3). Means topped by the same letter are not significantly different (DNMRT P = 0.05).

20 stems were examined for the incidence and severity of Rhizoctonia. All the treatments increased the percent of stems that were free of Rhizoctonia.



UTC Myconate .5X Myconate 1X Myconate 2X Both Employ 1X3 Employ 1X20%

10%

20%

30%

40%

50%

60%

70%

80%

Pe

rce

nt

Rh

izo

cto

nia

Fre

e

c

b

ab ab

a

abab


There was no significant difference in the percent of stems with slight Rhizoctonia damage.




5%

10%

15%

20%

25%

30%

35%

Pe

rce

nt

Slig

ht

Rh

izo

cto

nia

Da

ma

ge

a a

a

a

aa

a



All the treatments decreased the percent of stems with moderate Rhizoctonia damage.




5%

10%

15%

20%

25%

30%

35%

Pe

rce

nt

Mo

de

rate

Rh

izo

cto

nia

Da

ma

ge

b b

b

b b

b

a



All the treatments (except PHC-509 at the low rate) decreased the percent of stems with severe Rhizoctonia damage.



UTC 509 .5X 509 1X 509 2X 509 + 351 351 1X3 351 1X20%

2%

4%

6%

8%

10%

12%

14%

16%

18%

Pe

rce

nt

Se

ve

re R

hiz

oc

ton

ia D

am

ag

e aba

bcc

c

cc


Conclusions

• Four trials were conducted in Washington in which 20 stems from each treatment were classified as having no, slight, moderate, or severe Rhizoctonia damage.

• The trial results were treated as replicates and analyzed using Duncan’s NMRT, P = 0.05.

• All treatments increased the percent of stems free of Rhizoctonia damage.

• All treatments except the low rate of PHC-509 decreased the percent of stems with severe Rhizoctonia damage.

• All treatments decreased the percent of stems with moderate Rhizoctonia damage.



Documents

15 July 2009 INFLUENCE OF PHC SEED AND FOLIAR TREATMENTS ON IRISH POTATO GROWTH AND YIELD Summary of Rhizoctonia Data, Holland Ag Services, Washington