Over 50,000 lemon trees were planted in the Sacramento area between 1888 and 1891. The red orange scale (of the Japanese type) that plagued citrus crops is shown here on the stem, leaf and fruit of the tree. Published in 1888 by the State Printing Office, A TREATISE ON THE INSECTS INJURIOUS TO FRUIT AND FRUIT TREES OF THE STATE OF CALIFORNIA isolated diseases and identified the culprits while offering practical advice on eliminating the problems.
