University
of Illinois Extension
The
Bulletin
Pest management and crop development information for Illinois
No. 4, April 8, 2005TABLE OF
CONTENTS (links are to the website of The Bulletin)
Gather Information from Multiple Sources
Links to weekly pest management and crop development newsletters
published in 11 other north-central states are provided at the
Bulletin Web site.
Information on Three New Agricultural Pests Enhances Web Tool
for Farmers
Fruit tree leafroller, lilac borer, and western bean cutworm
have been added to the Illinois State Water Survey's Web-based
Water and Atmospheric Resources Monitoring Program. A degree-day
calculator lets users track and project growth cycles of 30
pests and monitor growing degree-days for corn and cold weather
crops.
Moth Captures Indicate That Some Pests of Concern Are Arriving
in Illinois
Some corn seedlings will be susceptible to injury by
early-season insect pests relatively soon.
A Little Clarification About Practicing Safe S.E.X. in 2005
Reader feedback to an article in issue no. 1 of the Bulletin has
generated clarifications on increasing application rates of soil
insecticides and using products with different modes of action
for controlling pests.
Scouting for Alfalfa Weevils
Those who haven't been out to their alfalfa fields should make
the first scouting trip soon. As degree-day accumulations near
400, larval tip feeding may become severe. Economic thresholds
and recommended insecticides are listed.
Soybean Aphids and Rust: Looking at the Glass Half Full
An entomologist at Michigan State University has compared
important similarities between soybean rust and soybean aphid
management.
Outlook for Soybean Rust in Illinois
There are many questions about what to expect and how to plan
for managing soybean rust when it arrives in Illinois. What is
known and what is not yet known are discussed.
Update on Management of Soybean Rust with Fungicides in Illinois
Fungicide applications are the primary management strategy for
soybean rust. Current information relevant to Illinois is
detailed.
Considerations for Controlling Existing Vegetation Before
Planting
The amount of weed vegetation in no-till fields has generally
become more dense and composed of less familiar species in
recent years. Guidelines for controlling such vegetation before
planting no-till corn or soybeans are outlined, together with
control ratings for burndown herbicides.
Predicting Weed Emergence
Midwestern weed scientists have developed a factsheet to provide
direction related to timing and duration of weed emergence.
Crop Conditions and Soybean Seeding Rates
Crop conditions for wheat and corn are noted, and the question
of soybean seeding rates is detailed. Multiple studies into how
many seeds are needed per acre to maximize yield indicate that
the chance of getting yield increases as plant population moves
above 100,000 plants per acre is small.
Regional Reports
Reports are provided this issue for northern, southern, and
west-central Illinois. |