Calag Archive

Proper timing of treatments, as well as choice of insecticides, is highly important in preventing losses in both yield and quality from lygus bug feeding on lima beans. In these tests, early applications were important and use of the organo-phosphorus insecticides Cygon alone, or malathion in combination with toxaphene proved most effective for control of this pest.

Certain conditions resulting from tilling, bed shaping, planting, thinning, and cultivating practices may cause lettuce heads to develop off center—which leads the U. C. mechanical selective lettuce harvester to “believe” that the heads are not ready to harvest, or affects the harvester's ability to cut the heads accurately.

campo and jacumba are inbreds from the trihybrid cantaloupe cross (L.J. (La Jolla) 36486 (also designated P₃) X PMR 45)-F₁ X PMR 450. A fourth generation inbred selection was twice backcrossed to PMR 450. Resistant sibs were crossed with two different commercial stocks of PMR 450 at the final cross. Inbreeding and selection were continued for eight generations in each of the two breeding lines.

If the 1950's became known to California rice growers as the years in which broadleaf weeds were finally controlled, then the 1960's appear to be the years in which grassy weeds—especially watergrass or barnyard grass—might also be brought under control with the use of selective chemicals. Preliminary tests and observations described in this report indicate that propanil, applied as a postemergence spray, and Ordram, a granular material applied at the preflood stage, may offer good control of watergrass in California rice fields which are continuously flooded during the growing season.

Recent field experiments indicate that commercial preparations of the nucleo-polyhedrosis virus of Heliothis zea and the bacterium, Bacillus thuringiensis Berliner, offer much promise for effective and selective control of early instar bollworms on cotton.