. Cooperative economic insect report. Beneficial insects; Insect pests. - 369 - STATUS OF SOME MORE IMPORTANT INSECTS IN THE UNITED STATES ALFALFA PLANT BUG (Adelphocoris lineolatus (Goeze)) Economic Importance: This plant bug of European origin was first recorded in North America at Cape Breton, Nova Scotia, Canada, in 1917. The first record of the pest in the United States was at Ames, Iowa, on June 18, 1929. The insect was probably introduced into the United States as eggs in packing material, as about 700 seed samples were imported and grown at the agronomy farm at Ames in 1926 and 1927. A
. Cooperative economic insect report. Beneficial insects; Insect pests. - 369 - STATUS OF SOME MORE IMPORTANT INSECTS IN THE UNITED STATES ALFALFA PLANT BUG (Adelphocoris lineolatus (Goeze)) Economic Importance: This plant bug of European origin was first recorded in North America at Cape Breton, Nova Scotia, Canada, in 1917. The first record of the pest in the United States was at Ames, Iowa, on June 18, 1929. The insect was probably introduced into the United States as eggs in packing material, as about 700 seed samples were imported and grown at the agronomy farm at Ames in 1926 and 1927. Alfalfa plant bug can be very destructive to alfalfa seed. During 1955 in Illinois, counts of the species reached as high as 440 per 100 sweeps in some alfalfa fields; and irr southeastern Nebraska in 1956, nymphs of this pest could be collected at the rate of 40 to 50 per 10 sweeps during early June. Distribution: Algeria, Austria, Canada, China, Finland, France, Germany, Great Britain, India, Iran, Japan, Sweden, Tunisia, United Arab Republip (Syria), USSR (including Siberia) and the United States (see map). Hosts: Alfalfa and sweetclover are the preferred hosts. A limited number of other legumes and many succulent herbaceous plants, such as, chrysanthemum, thistle, beets, sugar beets, cotton, castorbean, potato and buckwheat, are recorded hosts. Life History and Habits: Alfalfa plant bug prefers to feed on flower buds and newly formed seeds of host plants. Feeding injury is believed to be phytotoxic. The pest also injures the plants in oviposition and is attracted to lights at night. Only two generations occur in the latitude of St. Paul, Minnesota, and these overlap considerably. Alfalfa plant bug overwinters in the egg stage in Minnesota and other forms are killed with the advent of cold weather. Overwintering eggs are laid singly in the less-succulent stems near the soil surface of the host plants and begin hatching by the middle of May the following year. Nymphs pass thro
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