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Systemic insecticides— compounds which can be absorbed readily by plant foliage and roots and subsequently trans-located throughout the plant—render the plant tissues poisonous or unpalatable to juice feeding insect pests.

A critical stage in the production of olives—as in any fruit crop—is when the flower parts are forming in the buds.

This is the second of two articles on the quality of water and plant tolerance to salts. The previous article, in the October issue of California Agriculture, explained the classification of irrigation waters in three groups: Class I. Excellent to Good—Safe and suitable for most plants under any condition of soil and climate. Class II. Good to Injurious—Possibly harmful for certain crops under certain conditions of soil OT climate. Class III. Injurious to Unsatisfactory—Probably harmful to most crops and unsatisfactory for all but the most tolerant.

Smog injury to crops in Los Angeles County in 1949 amounted to an estimated loss of $479,495.00.

The first successful experiments in microbial control of a California crop pest had their beginning in the diagnostic part of the laboratory of insect pathology in the Division of Biological Control in Berkeley.

Two outstanding causes of small fruit size in oranges are poor physical conditions of the soil and inadequate irrigation.

Conflicting reports on the effectiveness of wind machines—installed as a substitute for the artificial heating of citrus orchards—prompted a study of the efficiency of the machines, under Orange County conditions.