AGRICULTURAL SCIENCE
digest

PURDUE UNIVERSITY
Vol. 7, Jan-Feb., 1965

CEREAL LEAF BEETLE CONTROL
Very high control of spring infestations of the cereal leaf beetle was obtained with either carbaryl or malathion applied by aircraft at the rate of one pound of toxicant per acre in a volume of one gallon of spray.

Carbaryl was more effective than malathion because of its persistent residual action, its apparent ovicidal effect and its equally high activity when applied from an altitude of 50 feet.

Malathion was ineffective when applied at an altitude of 50 feet.

Carbaryl was most effective when used in combination with a sticker.

There appeared to be little difference in control from the volume of spray applied, although some of the data suggest better results with lower volumes tested.

Journal Paper 2264, Robert F. Ruppel and M. Curtis Wilson, Entomology Departments of Michigan State University and Purdue University.

Further Research was conducted in 1964 with a totally new concept in application.

Technical malathion (97 percent) with no water or carrier of any kind was applied to the research plots. Results of these tests lead research workers to the following conclusions:

1. A concentrate spray of technical malathion applied from an altitude of 50 feet is effective against the cereal leaf beetle adult but the more conventional spray using water as a carrier is not effective .

2. Concentrate sprays of technical malathion are very effective against adult cereal leaf beetles, but only moderately effective against the larvae. Control as high as 97 percent of the adult population was obtained with an application of only 2.5 ounces (3.2 ounces actual toxicant) per acre.

3. Carbaryl applied as a conventional spray using 1 pound of toxicant with 1 ounce of sticker (UCAR W-130) in 1 gallon of water per acre continues to give longer residual kill and a higher percent larval control than malathion, regardless of formulation or method of application.

Journal Paper 2453, M. Curtis Wilson, Robert F. Ruppel and Robert E. Treece, Entomology Departments of Purdue, Michigan State and Ohio State Agricultural Experiment Stations.

RESIN STRIP USED TO CONTROL COCKROACH
Plastic resin strips containing 20 percent dichlorvos were tested in the laboratory and under actual household conditions to control German cockroaches.

AGRICULTURAL EXPERIMENT STATION • COOPERATIVE EXTENSION SERVICE