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Production rates—affecting hourly costs—of earthmoving equipment vary with a given piece of work and the type of machine used.

Zinc deficiency of avocado trees—a problem common in California orchards—has retarding effects on tree growth, fruit production and in some varieties causes the fruit to be more round than is characteristic for the variety, which reduces the market value.

Preliminary studies on the efficacy of fertilizer applications to forest soils indicate that redwood, Douglas fir, and ponderosa pine respond differently to the fertility level of the soil—as judged by response of agricultural crops—and to the application of fertilizers.

Cover plants, such as ivies, honeysuckle, and Star Jasmine, may be controlled readily by maleic hydrazide—MH—applied as a spray to new growth.

The potato defect—internal black spot—involving the variety Netted Gem in the Santa Maria Valley is of considerable economic importance.

Fertilizer experiments in six potato fields and a nutrient survey of some 25 additional potato fields in the Santa Maria Valley showed that over half the fields were receiving insufficient quantities of potash fertilizers.

The following article is the last of a series of reports of a survey of characteristics of and services offered by retail grocery stores in five counties in California made cooperatively by the Department of Home Economics, University of California, and the United States Department of Agriculture under the authority of the Research and Marketing Act as part of Western Regional Research Project WM-26.

Thirty-six insecticides, used both as emulsifiable concentrates and wettable powders—when both were available—and 19 types of inert dust diluents were included in laboratory studies on their immediate and residual effectiveness in the control of vinegar flies—Drosophila melanogaster Meigen.