Doug Doohan
SANDEA
- Last week (VegNet Vol. 9, No. 4, April 11, 2002) you
learned about the Section 24C label for Sandea use on a
variety of cucurbit crops. The current label (available on
the Internet at http://www.oardc.ohio-
state.edu/weedworkshop/) provides for application of Sandea
to cucumbers, winter squash, pumpkins, cantaloupes,
honeydew melons and crenshaw melons. Other crops may be
added in future years. Sandea may be applied pre-emergence
(PRE) or post-emergence (POST). PRE treatments control
fewer weed species than do POST treatments; however, common
lambsquarters and purslane are controlled with PRE
treatments but not with POST. PRE and POST treatments of
Sandea will control pigweeds, but nutsedge control is best
with POST treatments. POST treatments always require
inclusion of a nonionic surfactant at 0.25% V/V - 1 Qt/ 100
Gal). Because 2 applications can be made per growing
season, a strategy of interest to many growers might be to
use a PRE application to control lambsquarters and purslane
followed by a POST application to improve control of
nutsedge and late emerging pigweeds. Sandea works slowly.
It may take 1 to 3 weeks for sensitive weeds to die. PRE
applications may cause severe injury if 1 inch or more
rainfall occurs between Sandea application and crop
emergence. As with POST treatments, the grower assumes all
liability for crop damage. POST a treatment when the crop
has 2-5 true leaves is safest for the crop. Chlorosis
(yellowing) during the first several days after application
is common with POST Sandea. However, chlorosis is temporary
and yield is not affected. Ohio research has focused on
cucumbers and pumpkins. We have found that pumpkins are
more sensitive to Sandea than are cucumbers and slight
stunting may occur in addition to chlorosis.
It has taken the support of Gowan Company, the IR-4 Program
and many years of research at universities across the
country to achieve a new herbicide registration for
cucurbits. Using unlabelled herbicides on these crops will
jeopardize the future of this new Sandea registration and
discourage future research. It is now up to growers to show
that there is deep grassroots support for the research and
minor use registration programs that have made this
possible.
STATEGY
- After many years of concern about the status of Command,
Strategy by United Agri Products has finally resolved
grower's problems. Strategy, which is a pre-mix of
clomozone (Command) and ethalfluralin (Curbit), has a
national label for grass and broadleaf weed control in
cucumbers, melons, pumpkins, squash and watermelons.
Strategy is microencapsulated in order to minimize (but not
prevent) movement of the herbicide away from the site of
application. Because it contains clomozone, which is
inherently volatile, it is still very important to avoid
using Strategy under conditions when spray particles may be
carried by air currents to areas where sensitive crops and
plants are growing, or when temperature inversions are
likely to occur. Do not apply when winds are above 10 mph.
Also, Strategy should not be used within 300 feet of towns
and housing developments, commercial production of fruit and
non-labeled vegetables, commercial greenhouses and
nurseries. The most effective way to reduce drift
potential is to apply large spray droplets. Achieving
larger droplets is a function of spray volume, pressure and
nozzle orifice size.
Strategy should be applied after seeding and before crop and
weed emergence. It should never be incorporated, in
contrast to Command, or crop injury will occur. The
application rate ranges from 2-6 Pt/A is dependent upon soil
texture (see label for breakdown). Rainfall (1/2 inch
within 5 days of application ) or irrigation (1/2 inch
within 2 days of application) is required to activate
Strategy. At recommended rates Strategy should control most
annual grass weeds. Broadleaf weed control is generally
good but ragweed, smartweed and to some extent pigweeds are
only partially controlled.
VALID OH 24(c) REGISTRATIONS
Copies of these labels are available to download from the
Pesticide Education Program website listed below. (requires
Adobe Acrobat software) All labels are listed and the Sandea
label is at the bottom of the list.
http://pested.osu.edu/24c.html
By Brad Bergefurd, Hal Kneen and B. Precheur
SOUTHEAST
Starting to plant tomatoes on black plastic beds and some
growers are experimenting this year using row tunnels.
Tomatoes were also planted in west central OH this week with
row covers used to protect them when we return to normal
April weather.
Sweet corn is just past the spike stage on bare ground.
Plastic corn is up also. Less than 50% planted at this
stage.
Cabbage plantings are almost done for all the early
plantings.
Heavy rain of almost 2 inches delayed planting in the
beginning of the week.
Asparagus beetles are widespread on new shoots and spears.
SOUTHWEST
Some areas received over 3 inches of rain over the weekend.
Last nights storms (Wed) brought some areas another .25 to
.5 inch with heavy rainfall and winds.
Field work has slowed but some sweet corn was planted Wed.
afternoon and some growers are spraying herbicides on sweet
corn that was planted last week.
Aphids have been found in a tomato planting. Weeds are
beginning to emerge through holes in black plastic mulch.
Tomatoes on plastic are being fed through trickle
irrigation.
Seeding of melons, watermelons continues in the greenhouse.
Planting of potatoes, onions, tomatoes, cabbage, broccoli
continues.
BAINBRIDGE PRODUCE AUCTION- 1st sale for 2002
Friday April 19, 4:00 pm
Friday sales at 4pm through April
Route 41 South, 5 miles south of U.S. Route 50
Bainbridge Ohio (Just East of Hillsboro and west of
Chillicothe)
Bedding plants, baskets, flowers, early season lettuce, high tunnel strawberries, and other early season produce.
By Matt Kleinhenz
A new bulletin entitled Soil Quality in Vegetable and Small
Fruit Production by Matt Kleinhenz and Peter Bierman is
available online in html and pdf formats.
The address is: http://ohioline.osu.edu/b898/index.html
By Robert Precheur
AKRON-CANTON
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 50 64| 43 59| 37 52| 35 57| 41 61| 38 59|
WIND | 7 10| 7 10| 7 9| 6 10| 8 12| 8 11|
PREC.
PROB. 24 | 72 | 77 | 43 | 31 | 46 | 45 |
CLEVELAND
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 48 61| 41 57| 37 50| 37 58| 43 60| 39 58|
WIND | 6 8| 8 9| 7 8| 6 9| 7 10| 7 9|
PREC.
PROB. 24 | 73 | 75 | 39 | 33 | 47 | 45 |
COLUMBUS
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 54 66| 46 58| 39 54| 38 60| 42 63| 41 61|
WIND | 4 7| 5 8| 6 8| 4 7| 5 9| 6 7|
PREC.
PROB. 24 | 77 | 82 | 44 | 30 | 45 | 41 |
CINCINNATI
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 55 69| 50 61| 41 58| 41 65| 45 61| 40 64|
WIND | 9 10| 9 11| 9 10| 6 9| 9 11| 8 11|
PREC.
PROB. 24 | 80 | 86 | 43 | 29 | 43 | 38 |
DAYTON
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 53 64| 46 60| 39 54| 38 60| 43 59| 40 58|
WIND | 6 8| 6 8| 7 8| 6 9| 7 11| 7 8|
PREC.
PROB. 24 | 81 | 84 | 41 | 31 | 45 | 39 |
TOLEDO
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 47 62| 40 56| 35 54| 36 60| 42 61| 37 58|
WIND | 8 10| 9 11| 8 11| 7 10| 8 14| 10 11|
PREC.
PROB. 24 | 79 | 76 | 34 | 35 | 48 | 42 |
YOUNGSTOWN
DAY DATE | SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25|
TEMP
MIN/MAX | 50 63| 41 59| 36 51| 34 56| 40 61| 37 59|
WIND | 6 9| 7 9| 6 9| 6 9| 7 10| 7 9|
PREC.
PROB. 24 | 69 | 74 | 43 | 31 | 46 | 46 |
* LEGEND:
TEMP MIN/MAX - forecasted minimum and maximum temperature
for time periods midnight to noon and noon to midnight.
WIND - MEAN WIND SPEED (KTS) FOR TIME PERIODS midnight to
noon and noon to midnight.
PREC. PROB. 24 - probability of precipitation for the 24
hour period.
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