. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 12 SOME INSECTS INJURIOUS TO TRUCK CROPS. near the bottom, causing bunches of the phint to float. In portions of streams AA'here these sowbugs have been found most abundantly they are frequently seen crawling in a thick mass at the bottom. They feed, so far as known, exclusively on cress, not being reported as attacking any other form of vegetation. REPORTS OF INJURIOUS OCCURRENCES. This sowbug has been observed as a pest since 1002. Our first report of its pernicious habits was made in 190-1, when we received sp
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 12 SOME INSECTS INJURIOUS TO TRUCK CROPS. near the bottom, causing bunches of the phint to float. In portions of streams AA'here these sowbugs have been found most abundantly they are frequently seen crawling in a thick mass at the bottom. They feed, so far as known, exclusively on cress, not being reported as attacking any other form of vegetation. REPORTS OF INJURIOUS OCCURRENCES. This sowbug has been observed as a pest since 1002. Our first report of its pernicious habits was made in 190-1, when we received specimens through Mr. J. ^V. Bryan, Anacostia, D. C, from Hall- town, W. Va., where it was very injurious to water cress. In March, 1905, Mr. Powell Arnette reported injury at Gaylord, Va., to cress grown in spring water. The sowbugs were always found in the water and did not attack cress above the surface. .Vfter destroying the last vestige of cress in one of his ponds they remained on the bottom '' a foot deep," crawling about on the mud. During 1900 (June 18) Mr. John H. Reed, Carlisle, Pa., wrote in regard to this species and its destructive Avork on w^ater cress in his locality. Specimens were re- ceived August 11. The sowbug was ob- served principally on the roots and lower leaves, crawling up along the stem and cutting ofi' the leaves. August 10 Mr. (xeorge C. Jordan. Washington. D. C, sent specimens from Basic City, Va., &*tating that this "* water bug" was devouring his cress beds, and, since a million or more were colonized on the plants, there would be no crop at the rate they were reproducing. When the plants were lifted the sowbugs were observed to drop from Fig. 3.—The (Mancasdius water-cress sdwbug bra<;). En- larged (after Riehardsov) METHODS OF CONTROL. Three Avays of controlling this species are suggested. The first and most important consists in a method of growing the water cress so as to eliminate injuries by the sow
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