Evaluating Efficacy of Selected Fungicides on
Controlling Jack-O-Lantern Pumpkin Diseases, Champaign, IL
M. Babadoost and M. Hurt Department of Crop Sciences,
University of Illinois, Urbana-Champaign
In 2003, a field trial is
being conducted at the University of Illinois Vegetable Research Farm at
Champaign, IL, to evaluate the efficacy of selected fungicides on controlling
diseases of jack-o-lantern pumpkin.
The soil is a silt clay loam
(Drumer) with pH 6.5. Soil was deep-tilled in the fall of 2002 after corn was
harvested and disked before seeding. Fertilizers, 115 lb nitrogen, 101 lb
phosphorous, and 120 lb potassium per acre, were broadcast and incorporated
into the soil on 26 March. Roundup herbicide (2 pt/A) was applied on 8 May.
Jack-o-lantern pumpkin cultivar Howden seeds were planted on 16 June. Seeds
were sown 18 inch apart in single-row plots, 20 ft long. The plots were spaced
40 ft apart in a completely randomized block design with four replications.
Furadan insecticide (2 pt/A) was broadcast over planted rows on 17 June and the
plots were sprayed with capture insecticide (4 oz/A) on 22 July and with Pounce
(4 oz/A) on 1 August. Herbicide Strategy (4 pt/A), in 20 gal of water/A, was
applied over entire field on 17 June. Also, the field was sprayed with
herbicide Poast Plus (2.25 pt A), for controlling grasses, and Permit (1 oz/A),
for controlling broadleaf weeds, on 14 July.
In addition, during the season, weeds are controlled by cultivation and
hand weeding. Cucumber beetles and other insects are managed by applying
Capture (4 fl oz/A), using 20 gal of water, per acre.
Twelve fungicides, Acrobat
50WP, AgriFos-400, BASF-516 WG , Bravo Ultrex 82.5WG, Cabrio 20EG, Cuprofix
Disperss, Cuprofix-concentrated, Flint 50WG, Nova 40W, Phostrol, Procure 50WS, and
Quadris 2.08SC (Table 2), in 15 different combinations (treatments) (Tables 1
& 3), are spray applied onto plants. Application of fungicides began on 21
July and will continue (at 7-day intervals) until 22 September. Fungicides are
applied with a backpack sprayer using 50 gal of water per acre. Disease incidence (percentage of foliage or
fruit affected) and disease severity (percentage of total area of vines,
leaves, or fruit infected) are visually evaluated weekly from 22 August to 30
September. Disease incidence and severity are assessed at four locations (43 sq
ft each) in each plot, and at the same locations, throughout the season (a
total of seven). Area under disease progress curve (AUDPC) for each treatment will
be calculated by plotting mean disease severity of the seven evaluations. Fruit
number and weight in each plot will be determined around 7 October. Major
diseases of jack-o-lantern pumpkins in this area are powdery mildew, downy
mildew, Plectosporium blight, Fusarium wilt and fruit rot, gummy stem blight
and black rot, Sclerotinia rot, bacterial wilt, bacterial leaf spot and fruit
rot, and virus diseases.
Table 1. Treatment list
____________________________________________________________________________________________
1.
Control
2.
Natural Day Light
3.
Red Light
4.
(Cabrio 20EG) / (Bravo Ultrex 82.5WG)
5.
(Cabrio 20EG) / (Nova 40W) / (Bravo Ultrex 82.5WG)
6.
(BASF-516 WG) / (Cuprofix Disperss)
7.
(BASF-516 WG) / (Bravo Ultrex 82.5WG)
8.
(BASF-516 WG) / (Nova 40W) / (Bravo Ultrex 82.5WG)
9.
(Quadris 2.08SC) / (Cuprofix Disperss)
10.
(Quadris 2.08SC) / (Cuprofix-Concentrated)
11.
(Flint 50WG) / (Cuprofix Disperss)
12.
(Acrobat 50WP + Cuprofix Disperss) / (Cuprofix
Disperss)
13.
(Procure 50WS + Latron CS-7) / (Quadris 2.08SC +
Latron CS-7)
14.
(Procure 50WS + Latron CS-7) / (Cabrio 20EG + Silwet
L-77)
15.
(Quadris SC + Latron CS-7) / (Nova 40 W + Latron CS-7)
16.
(Procure 50WS + Latron CS-7)
17.
AgriFos-400
18.
Phostrol
______________________________________________________________________________
/ = Alternated.
Table 2. Fungicides applied
|
Fungicide |
a.i.* (%) |
Manufacturer |
Fungicide |
a.i. (%) |
Manufacturer |
||
|
Acrobat
50WP |
AC |
50 |
BASF |
Flint 50WG |
FL |
50 |
Bayer |
|
AgriFos-400 |
AF |
45.8 |
Agrichem |
Latron CS-7 ** |
LA |
-- |
Dow |
|
BASF-516
WG |
BASF |
38 |
BASF |
Nova 40W |
NA |
40 |
Dow |
|
Bravo
Ultrex 82.5WG |
BU |
82.5 |
Syngenta |
Phostrol |
PL |
53.6 |
Nufarm |
|
Cabrio
20EG |
CAB |
20 |
BASF |
Procure 50WS |
PR |
50 |
Uniroyal |
|
Cuprofix
Disperss |
CU |
36.9 |
Cerexagri |
Quadris 2.08SC |
QA |
22.9 |
Syngenta |
|
Cuprofix-Concentrated |
CU-N |
36.9 |
Cerexagri |
Silwet L-77 ** |
SIL |
-- |
Helena |
* Active
ingredient.
** Spray adjuvant (surfactant).
