Calag Archive

Houseflies which have developed resistance to DDT residual sprays have also become resistant to other organic insecticides.

Bucks of the California mule deer and the black-tailed deer usually are in prime condition—with the antlers hard—in August and early September. On the basis of palatability and vitamin content the meat of the mule deer from Santa Barbara and Ventura counties was found to be desirable from June through August and the meat of the black-tailed deer from Marin County was most palatable from the middle of March through July. The vitamin content of black-tailed deer meat seemed to be highest in the winter months.

Environmental temperatures of approximately 75° F for hogs weighing 70 to 144 pounds and 60° F for hogs between 166 and 260 pounds were the temperatures under which experimental swine at Davis made the largest daily gain and required the least amount of feed to produce 100 pounds of gain when the temperature was kept constant.

This is the eighth article in a series of brief progress reports on the application of the science of genetics to commercial agriculture.

By-products of one branch of agriculture can be utilized to great advantage by another group of farmers.

Olive trees should be irrigated earlier in the spring and—in addition to the summer irrigations—later in the fall than is necessary with deciduous fruits.

Breaking the rest period of leaf buds of deciduous plants is generally admitted to be brought about mainly by the low temperatures of late fall, winter and early spring.

Analysis of citrus leaves as an aid in the diagnosis of the nutritional status of orchard trees—with particular attention given to the potassium state of orange trees—has been under study for a number of years at the Riverside Experiment Station.

The orangetortrix—Argyrotaenia citrana—has been a major insect problem in the apple orchards of California's coastal counties for the past two or three seasons.

Control of fig canker can be effected by new pruning and cutting methods.

Two varieties of cucumbers—Chicago Pickling and Cubit—were selected to test to what extent limiting the number of fruits which mature per plant would affect the yield and quality of the seed produced.