Southeastern U.S. Vegetable Crop Handbook - 2023 - 297

DISEASE CONTROL
TABLE 3-45. GREENHOUSE DISEASE CONTROL FOR VARIOUS VEGETABLE CROPS (CONT'D)
R. A. Melanson, Extension Plant Pathologist, Mississippi State University; A. Keinath, Plant Pathologist, Clemson University;
A. Cato, Extension Horticulture IPM, University of Arkansas; I. Meadows, Extension Plant Pathologist, North Carolina State University
Minimum Days
Harv.
Crop/Disease
Alternaria blight, Alternaria leaf
spot, anthracnose, Cercospora
leaf spot, gummy stem blight,
scab, target leaf spot
Suppression: Plectosporium
blight, powdery mildew
Alternaria leaf spot, angular leaf
spot, anthracnose, bacterial fruit
blotch, Cercospora leaf spot,
downy mildew, gummy stem
blight, powdery mildew, scab
Alternaria leaf spot, Cercospora
leaf spot, downy mildew,
Phytophthora rot (P. capsici)
Powdery mildew (Golovinomyces
spp. 2
and Podosphaera spp. 2
)
mancozeb +
copper hydroxide
(ManKocide)
mancozeb
+
zoxamide
(Gavel 75DF)
myclobutanil
(AgriStar Sonoma
20 EW AG,
AgriStar Sonoma
40WSP)
M03+
22
3
1.5 to 2.0 lb/acre
4.75 to 9.5 fl oz/acre
(20 EW AG)
2.5 to 5 oz/acre
(40WSP)
5
2
1
M03+
M01
2 to 3 lb/acre
5
See
label
Product 1
mancozeb +
azoxystrobin
(Dexter Max)
FRAC
M03+
11
Rate of Material
CUCURBITS - AFTER TRANSPLANTING IN A GREENHOUSE (cont'd)
2.1 to 3.2 lb/acre
5
1
See label for restrictions on greenhouse use. Do
not apply more than one application of product of
FRAC Group 11 fungicide before alternating to a fungicide
with a different mode of action. Do not exceed
12.8 lb of product per acre per season. See label for
application limits of active ingredients. Do not exceed
four applications per year. See label for additional
instructions and cautions regarding adjuvants and
tank mixing.
Not prohibited for greenhouse use. Do not exceed
17.5 lb of product per acre per year. Do not apply
more than 5 applications per year at the maximum
application rate. Phytotoxicity may occur when spray
solution has a pH of less than 6.5 or when certain
environmental conditions occur.
Not prohibited for greenhouse use. Do not exceed
16 lb per acre per year. Do not make more than eight
applications per acre per year.
Not prohibited for greenhouse use. Do not exceed
0.6 lb myclobutanil per acre per crop. See product
labels for additional instructions and restrictions.
Sonoma 20EW AG: Do not exceed 46 fl oz of
product per acre per crop. Sonoma 20EW AG is not
registered for use in AL, AR, FL, KY, MS, OK, SC,
TN, or TX.
Sonoma 40WSP: Do not exceed 1.5 lb of product
per acre per crop. Sonoma 40WSP is not registered
for use in AL, AR, FL, GA, KY, LA, MS, OK,
SC, TN, TX, or WV
Alternaria leaf spot and blight
(Alternaria spp.), gray mold (B.
cinerea), gummy stem blight
(Stagonosporopsis spp.2
),
powdery mildew (P. xanthii, G.
cichoracearum 2
), Sclerotinia
stem rot (S. sclerotiorum)
Labels may include:
Downy mildew, root rots
phosphonates
(mono- and
dibasic salts
of phosphites,
phosphorous
acid, potassium
phosphite)
(various)
Corynespora leaf spot
(Corynespora cassiicola), early
blight (Alternaria spp.), gray
mold (Botrytis), gummy stem
blight (Stagonosporopsis spp.2
polyoxin D zinc
salt
(OSO 5%SC)
),
powdery mildew (Podosphaera
spp. 2
1
2
), scab (Cladosporium spp.)
Products registered for field use may be used on greenhouse crops (but not transplants) unless excluded on the label. Always check the label before applying a
product. Additional products not prohibited for greenhouse use on basil, cucurbits, and lettuce not listed in this table are available.
Former names of diseases and pathogens listed in this table that may be still be listed on fungicide labels are as follows: Acidovorax citrulli (formerly Acidovorax
avenae subsp. citrulli) Alternaria linariae (formerly A. solani and A. tomatophila); Athelia rolfsii (formerly Sclerotium rolfsii); Golovinomyces spp. (formerly
Erysiphe spp.) or Golovinomyces cichoracearum (formerly Erysiphe cichoracearum); Fulvia fulva (formerly Cladosporium fulvum and Passalora fulva); Boeremia
exigua (formerly Phoma exigua); Plectosphaerella cucumerina (formerly Plectosporium tabacinum); Podosphaera xanthii (formerly Sphaerotheca fuliginea);
Stagonosporopsis spp. (formerly Didymella); Xanthomonas leaf spot (formerly bacterial leaf spot); and (Xanthomonas cucurbitae (formerly X. campestris pv.
cucurbitae).
P07
See label
See label
See
label
penthiopyrad
(Fontelis)
7
0.375 to 0.5 fl oz/gal
of spray per 1,360
sq ft
1
0.5
Allowed for use in greenhouse production of edible-peel
cucurbits (cucumbers, summer squash).
Do not exceed 67 fl oz of product per acre per year.
Make no more than two consecutive applications per
season before alternating with fungicides that have a
different mode of action. **Resistance in Stagonosporopsis
2
(gummy stem blight) is widespread.**
See product labels for complete application instructions,
labeled diseases, restrictions, and crop and
greenhouse usage. Check state registration status
prior to use.
Reentry
Method, Schedule, and Remarks
19
6.5 to 13.0 fl oz/acre
4 hr
Not prohibited for greenhouse use. See product
labels for maximum limits of active ingredient and
applications per season. See product labels for additional
application instructions and labeled diseases.
OSO 5%SC is not registered for use in AR, KY,
MS, or OK.
2023 Vegetable Crop Handbook for Southeastern United States
297
Southeastern U.S. Vegetable Crop Handbook - 2023

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