IR-4 Ornamental Horticulture Program Research Report Cover Sheet 20140730a.pdf

20140730a.pdf
IR-4 Ornamental Horticulture Program
Research Report Cover Sheet
Trial: 2014 TX
Researcher(s) Mengmeng Gu (TX A
Texas AgriLife Extension Service
Affiliation:
Department of Horticulture Sciences
2134 TAMU
College Station
PhoneNumber: 979-845-8567
[email protected]
Email:
ProjectTitle:
Protocol #:
PR#
27333
29991
TX
77843
Acibenzolar Crop Safety
14-003
Research Target
Crop/Plant
Product
EPA Reg. # Production Site
Phytotoxicity
Pothos
Insimmo
100-922
Phytotoxicity
Epipremnum aureum
Acibenzolar-S-methyl
Syngenta
Phytotoxicity
Sunflower
Insimmo
100-922
Phytotoxicity
Helianthus sp.
Acibenzolar-S-methyl
Syngenta
ProjectTitle:
Protocol #:
Status
Field Container
C
Field Container
C
Benzovindiflupyr + Azoxystrobin (A18126B) Crop Safety
14-003
PR#
Research Target
Crop/Plant
Product
31594
Phytotoxicity
Phytotoxicity
Pothos
Epipremnum aureum
Mural (A18126B) WDG
Benzovindiflupyr + Azoxystro Syngenta
Greenhouse
C
Field Container
C
Field Container
C
31505
31757
Phytotoxicity
Sunflower
Mural (A18126B) WDG
Phytotoxicity
Helianthus sp.
Benzovindiflupyr + Azoxystro Syngenta
Phytotoxicity
Phytotoxicity
Bee Balm
Monarda didyma
Mural (A18126B) WDG
Benzovindiflupyr + Azoxystro Syngenta
ProjectTitle:
Protocol #:
PR#
31740
31746
EPA Reg. # Production Site
-
Status
Difenconazaole + Azoxystrobin (A13703G) Crop Safety
14-003
Research Target
Crop/Plant
Product
EPA Reg. # Production Site
Phytotoxicity
Aster
Alibi Flora (A13703G) SC
Phytotoxicity
Aster sp.
Difenconazole + Azoxystrobi Syngenta
-
Phytotoxicity
Phytotoxicity
Bee Balm
Monarda didyma
Alibi Flora (A13703G) SC
Difenconazole + Azoxystrobi Syngenta
Status
Field Container
C
Field Container
C
Project Report: 2014 IR-4 SOR Ornamental
Project 14-003 New Disease Products CS-Foliar
Mengmeng Gu, PhD, Assistant Professor/Extension Specialist, Department of Horticultural
Sciences, Texas A&M AgriLife Extension, College Station, TX [email protected]
Objective: Determine phytotoxicity for foliar fungicides on various ornamental
horticulture plants.
Plant materials: Liners of aster (Aster ‘Wood Pink’, sunflower (Helianthus ‘Table
Mountain’), and bee balm (Monarda ‘Pink Supreme’) in 72-tray were obtained from
Emeral Coast Growers (Pensacola, FL), pothos (Epipremnum aureum) in 4” pots were
obtained from Weatherford Farms and Greenhouses (Stafford, TX), and all plants were
potted in 6” azalea pots on April 4, 2014 with peat-based substrate (BM 6; Saint-Modeste,
QC, Canada). All plants designated for ‘Field Container’ experiments were placed under
full sun conditions with late afternoon shade from adjacent greenhouse, except that pothos
in ‘Field Container’s experiment were placed under 50% shade. Plants were hand watered
as needed.
Fungicide treatments: All plants were grown in a glasshouse before being subjected to
fungicide treatments listed in Table 1 based on IR-4 Protocol #: 14-003 New Foliar Disease
Products Crop Safety. Ten replicates of each plant in each PR Number (Table 1) were
arranged in a randomized complete block design. Three foliar applications were made on
May 20, June 3, and June 17 according to rates in Table 1.
Measurements: Initial growth index (GI; GI=plant height/2 + (plant width1+plant
width2)/4) was measured for all plants on May 20, except for pothos. Final GI of all plants
except pothos was measured on June 24, 2014. For pothos, a total of five plants were
harvested at substrate surface on May 152014 for initial dry weight, and five plants from
each treatment were harvested at substrate surface on June 24, 2014 for final pothos DW.
Phytotoxicity was recorded at 7 days after each of three fungicide applications (May 27,
June 10 and June 24). Pictures of representative plants from each treatment were taken on
June 24, 2014.
Results: There was no significant difference among the initial or final growth index (or dry
weight) of plants in each PR Number (Table 1). Some plants did not grow significantly
during the trial, which was probably due to the intensively hot conditions under Texas
summer. No phytotoxicity was observed on any of the treatments, which were documented
in Figure 1-3.
Table 1. Initial and final growth index (GI) of aster, bee balm, and sunflower, and initial
and final dry weight of pothos after three foliar applications of foliar fungicides based on
Protocol#14-003.
PR
Number
31740
31746
31757
Crop
Aster
Aster
'Wood Pink'
Bee Balm
Monarda
Didyma
'Pink
Supreme‘
Bee Balm
Monarda
Didyma
'Pink
Supreme’
Alibi Flora
(A13703) SC
Difenconazole +
Azoxystrobin
Field
Container
Rates
oz/100gal)
0
8
14
28
0
8
14
Mural (A18126B)
WDG
Benzovindiflupyr
+ Azoxystrobin
Field
Container
28
0
4
7
Product
Alibi Flora
(A13703) SC
Difenconazole +
Azoxystrobin
Production
Site
Field
Container
Initial
GI*
19.4
19.5
19.1
19.2
23.1
22.9
22.6
Final
GI
24.6
25.0
25.4
25.7
22.7
22.6
19.65
23.7
22.1
21.0
21.8
22.7
19.8
20.9
21.6
14
22.3
22.3
0
35.0
Pothos
Insimmo
0.25
36.4
Field
27333
Epipremnum
Acibenzolar-S19.8
Container
0.5
33.2
aureum
Methyl
1
35.8
0
36.3
Mural (A18126B)
Pothos
4
39.0
WDG
31594
Epipremnum
Greenhouse
19.8
Benzovindiflupyr
7
37.7
aureum
+ Azoxystrobin
14
41.3
0
25.5
23.5
Sunflower
Insimmo
0.25
23.7
24.6
Helianthus
Field
29991
Acibenzolar-S'Table
Container
0.5
25.4
24.7
Methyl
Mountain'
1
25.0
24.3
0
24.7
23.1
Sunflower
Mural (A18126B)
4
23.4
23.7
Helianthus
WDG
Field
31505
'Table
Benzovindiflupyr
Container
7
23.8
22.9
Mountain'
+ Azoxystrobin
14
23.4
23.1
* GI=plant height/2 + (plant width1+plant width2)/4. GI was not measured for Pothos. For
pothos, the presented data were shoot dry weight, and not GI. A total of five plants were
harvested at substrate surface on May 15 2014 for initial dry weight, and five plants from
each treatment were harvested at substrate surface on 24 June 2014 for final pothos DW.
All GI data were collected on the same day that pothos were harvested for DW
measurement.
Figure 1. Aster and bee balm after three applications of foliar fungicides based on
Protocol#14-003. There was no phytotoxicity on any rates of Alibi Flora for each of three
ratings at 7 days after each application.
Figure 2. Bee balm, sunflower and pothos after three applications of foliar fungicides based
on Protocol#14-003. There was no phytotoxicity on any rates of Mural for each of three
ratings at 7 days after each application.
Figure 3. Sunflower and pothos after three applications of foliar fungicides based on
Protocol#14-003. There was no phytotoxicity on any rates of Insimmo for each of three
ratings at 7 days after each application.