FROM AROUND THE STATE
ISSUE 6 June 8, 2000
CRUCIFER FLEA BEETLE ACTIVITY IN CANOLA.
Flea beetle activity peaked again over the weekend with the warmer
temperatures. Flea beetles are
still feeding actively on canola, but most of the earlier planted canola is in the 4-leaf to rosette growth
stages. So, some damage can be tolerated. Seed treatments from the earlier planted fields, late April to
early May, are no longer effective since it is past the 21 day protective period. Observations of fields
sprayed with Capture as a foliar have shown excellent control of flea beetles at both the lower rate,
1.3 fl. oz/A, and the higher rate, 2.6 fl. oz/A of Capture. The higher rate should give you a longer residual,
>7 days. Continue to monitor any canola fields in the susceptible crop stage, seedling, until next week.
Flea beetle activity should be slowing down next week.
CUTWORMS ACTIVE IN SUNFLOWER
Late instar dingy cutworms and early instar red-backed cutworms have
been reported damaging
sunflower fields in the northern part of the North Central Region. The worst case scenario was a field
with 50% of the sunflower seedlings cut it had to be replanted. An insecticide trial for cutworm control
on sunflower is being conducted with a new insecticide from Dupont.
SMALL GRAIN DISEASES
Low levels of tan spot, root rot, and septoria, have been observed
during Small Grains IPM Survey
Janet J. Knodel
Area Specialist Crop Protection
North Central Research and Extension Center
South-Central NDTotal rainfall as recorded at NDAWN sites in south-central ND during May 31 to June 6 ranged
Planting of all crop acreage should essentially be completed by
about June 10. Winter wheat is
beginning to head. Winter wheat and spring-seeded crops continue to be in good- to excellent-condition.
However, a few small grain fields have had disease or temperature-related problems. Alfalfa harvest
is in progress. Post-emergence herbicide application in small grain and canola is nearly complete,
continues in corn and flax, and is beginning in soybean. Some HRW wheat will be treated with
fungicides to maintain the high-yield potential. A trace amount of tan spot was found in a Stutsman
County HRW wheat field. Growers should be monitoring for leaf-spot disease in small grain, especially
in high-residue systems. Flea beetle and diamondback moth trap counts are increasing at the
Carrington Center. Currently, low levels of grain aphids can be found in the region.
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center
Rainfall around the region last week amounted to 0.1" or
less. Cool temperatures have allowed
crop development to occur without stress. Crops not well rooted will experience moisture stress as
temperatures warm this week. Crop planting is practically finished in the region. Rye is headed, winter
wheat is in the boot stage, wheat is from 6 leaf to emerging, most barley is 3 leaf and beyond, some
sunflower is emerging, some very early planted canola will bolt later this week. Crop spraying for wild
oat and broadleaf weeds is the main activity this week. Flea beetles in canola, cutworm activity on
sunflower in Nelson county and sunflower beetle emergence in large number are the insect problems
of concern this week . A nice rain would be appreciated.