Calag Archive

Two pens of 10 cows each–all between 60 and 150 days past calving–were used in a three-part feeding trial with lactating cows.

Silage from a sweet forage sorghum with a low grain-to-stalk ratio–variety Rex–was compared to silage from a dual purpose forage sorghum with a higher grain-to-stalk ratio–variety Hegari– and both were compared to alfalfa hay and alfalfa silage in feeding trials with beef steers. Two experiments were conducted; one with a limited concentrate ration, and the second, with a full feed of concentrate.

Spray applications of plant growth regulators, particularly 4-chlorophenoxyacetic acid–4-CPA–are widely used in some parts of California as an aid in obtaining set of tomato fruit during periods when the environment is unfavorable for natural fruit production. This practice is followed to a considerable extent in the tomato producing areas of San Diego County during the spring and fall months when night temperatures drop below the level favorable for the growth of pollen tubes and normal fertilization of the ovary.

The following article is the first of two reports on Quality Studies with Strawberries. The second article will appear in the near future.

Drywood termites–about as important in southern California as subterranean termites–have spread north to the San Francisco Bay region and Sacramento.

Two insecticides–Thiodan and endrin –gave excellent control of the peach tree borer in studies made during the 1957 and 1958 seasons in an attempt to find a more effective insecticide than DDT. and one with a longer residual life.

Zinc can stimulate the growth of citrus and avocado trees. Applied to the roots in nutrient solution at concentrations greater than required in sprays to correct mottled leaf symptoms, zinc will promote vegetative growth.

Deficiency of micronutrients in citrus trees is an important problem in central and southern California orchards.