May 5, 1995

Hortline Hours

Hortline hours from May through August will be from 9:00 a.m. to 5:00 p.m., Monday through Friday. Student interns will be helping answer calls during this period. The extended hours will hopefully give clients greater access to Hortline.


This article originally appeared in the May 5, 1995 issue, p. 58.

On-Farm Integrated Pest Management Trials for 1995

For the third consecutive year, ISU specialists Mark Gleason and Donald Lewis will coordinate on-farm trials of Integrated Pest Management (IPM) methods for control of diseases and insect pests. The crops involved this year, and the disease/insect problems targeted, are as follows:

CROP DISEASE/INSECT Apples Scab, fire blight, codling moth Strawberries Gray mold, tarnished plant bug Tomatoes Early blight, Septoria leaf spot, anthracnose

Pine Tree Insect Pests

May is an important month in the control of insect pests of pine trees. Pine needle scale, a common but variable pest, could still be controlled in the egg stage with a dormant oil spray before bud break (an unusual situation but a possibility in "late" springs like this one), though more typically we think of May as the time to control the crawler stage.

Purple Loosestrife

Purple loosestrife is a beautiful perennial plant that has a dark side. It has the ability to invade natural wetlands and displace native plants such as cattails and sedges. It also affects agriculture by becoming a nuisance in moist rangelands and in crops planted in flood plains. Some states have passed legislation officially designating purple loosestrife (Lythrum salicaria) as a noxious weed, and thus restricting its sale and distribution.

Trellis Construction

Grapevines can be supported and trained to a variety of structures. In the home garden, structures range from the decorative arbor to the conventional trellis.

Construction of a grape trellis is similar to constructing a farm fence. The trellis must be substantial enough to carry the weight of the vines plus a heavy crop during high winds. Basically, the trellis consists of 1, 2, or 3 wires stretched tightly and secured to firmly set posts.

Weed Control in Raspberries

Weed control in raspberries is necessary to reduce competition for water, nutrients, and sunlight. Cultivation and mulches are the most practical control measures for home gardeners. Cultivate the raspberry planting frequently during the spring and summer months. Small weed seedlings are relatively easy to destroy. Large weeds are more difficult. To prevent injury to the roots of the raspberry plants, don't cultivate deeper than 2 or 3 inches.

Must Producers Post Fields Under WPS?

In most cases, fields do not have to be posted under the Worker Protection Standard. Review the Agricultural Use Requirements box on the pesticide label to determine if posting is required. The majority of pesticides do not have a posting requirement.

Even if the label requires posting, you do not have to post if:

you don't employ nonfamily members.

Free Worker Protection Standard Publication

Training manuals and safety posters are among the free Worker Protection Standard publications you can order from ISU's Extension Distribution office.

The complete details of the Standard are contained in PAT-12, The Worker Protection Standard for Agricultural Pesticides--How to Comply manual. This EPA manual provides the information you need to comply with the federal standard that went into effect January 1, 1995. Every employer of agricultural crop production workers and pesticide handlers should have one.