Southeastern U.S. Vegetable Crop Handbook - 2023 - 198

DISEASE CONTROL
TABLE 3-1. DISEASE CONTROL PRODUCTS FOR ASPARAGUS
E. Sikora, Plant Pathologist, Auburn University
Disease/Material
CROWN ROT
mancozeb
(various)
GRAY MOLD
fenhexamid
(Elevate)
FRAC
Code
M
Rate of Material
Formulation
See label
Minimum Days
Harv.
Reentry
Method, Schedule, and Remarks
See label See label Soak crowns 5 min in burlap bag with gentle agitation, drain, and plant.
17
1.5 lb/acre
PHYTOPHTHORA CROWN ROT, SPEAR SLIME
mefenoxam
(various)
4
fosetyl-AL
(Aliette)
RUST
myclobutanil
(various)
sulfur
(various)
tebuconazole
(various)
copper oxychloride/ hydroxide
(Badge SC)
3
4 to 6 fl oz/acre
M 1 to 2.5 pints/acre
RUST, CERCOSPORA LEAF SPOT
chlorothalonil
(various)
mancozeb
(various)
mancozeb + azoxystrobin
(Dexter MAX)
PURPLE SPOT
azoxystrobin
(various)
chlorothalonil
(various)
mancozeb + azoxystrobin
(Dexter MAX)
trifloxystrobin
(Flint Extra 500 SC)
11
M
M3+11
11
6 to 15.5 fl oz/acre
2 to 4 lb/acre
2 to 2.2 lb/acre
3 to 3.8 oz/acre
100
190
180
180
4 hr
0.5
1
12 hr
Do not apply more than 1 foliar application of Quadris (or other group 11
fungicide) before alternating with a fungicide with a different mode of action.
Repeat applications at 14-to-28-day intervals depending on disease pressure.
Do not apply more than 12 pints/ acre during each growing season.
Apply only on ferns after spears have been harvested. Applications should
begin prior to disease development. Do not apply more than 8.5 lbs. of
product per acre per season.
Apply on a 14-day interval as needed. Make applications to the fern stage
only. Mow down the asparagus ferns (or allow the ferns to senesce) between
the last fungicide application and harvest.
M
M
M3+11
2 to 4 lb/acre
See label
2 to 2.2 lb/acre
180
0.5
48 hr
Apply to developing ferns at first sign of rust and repeat on a 14-day interval,
no more than 3 applications per season.
Recommended for tank mixture with other registered products. For disease
suppression only. Addition of spread/sticker is recommended.
190
180
180
0.5
1
1
Repeat applications at 14-to-28-day intervals depending on disease pressure.
Do not apply more than 12 pints/acre during each growing season.
Apply to ferns after harvest; spray at first appearance of disease at 7-to 10day
intervals. Do not exceed 8 lb product per acre per crop.
Apply only on ferns after spears have been harvested. Applications should
begin prior to disease development. Do not apply more than 8.5 lbs. of
product per acre per season.
3
M
5 oz/acre
See label
180
1
1
Begin applications to developing ferns after harvest has taken place. Repeat
on a schedule not to exceed 14 days. Do not apply to harvestable spears.
33
180
0.5
Apply at fern stage only. Make up to four applications. Repeat at 7-to 14-day
intervals if conditions favor disease development.
1 pt/acre
5 lb/acre
1
110
2
0.5
Apply over beds after seeding or covering crowns, 30 to 60 days before first
cutting, and just before harvest.
TABLE 3-2. IMPORTANCE OF ALTERNATIVE MANAGEMENT PRACTICES FOR DISEASE CONTROL IN ASPARAGUS
E. Sikora, Plant Pathologist, Auburn University; A. Keinath, Plant Pathologist, Clemson University
Scale: " E " excellent; " G " good; " F " fair; " P " poor; " NC " no control; " ND " no data.
Strategy
Avoid overhead irrigation
Crop rotation(5 years or more)
Clip and bury infected ferns
Destroy infected ferns
Encourage air movement/wider row
spacing
Plant in well-drained soil
Destroy volunteer asparagus
Pathogen-free planting material
Resistant/tolerant cultivars
198
Rust
F
NC
G
E
P
NC
F
NC
G
F
F
NC
G
E
P
NC
NC
NC
G
NC
G
E
G
NC
NC
NC
NC
F
NC
NC
NC
F
NC
E
G
NC
P
Cercospora blight Stemphylium blight Fusarium root rot Phytophthora crown/spear rot
NC
NC
NC
NC
F
NC
E
NC
2023 Vegetable Crop Handbook for Southeastern United States
Southeastern U.S. Vegetable Crop Handbook - 2023

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