. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 42 THE BEAN THKIPS. the bean thrips, and in confinement larvae were observed to kill and eat large numbers of the host. The young of Triphleps insidiosus Say were noticed on many occasions feeding on the young of this thrips and undoubtedly aid in reducing its numbers. The larvae and adults of Hippodamia con vergens Guer were fre- quently collected on plants infested with thrips, where they were busily engaged in feasting on the tender larvae of the bean thrips. On several occasions larvae of a predaceous thrips,
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 42 THE BEAN THKIPS. the bean thrips, and in confinement larvae were observed to kill and eat large numbers of the host. The young of Triphleps insidiosus Say were noticed on many occasions feeding on the young of this thrips and undoubtedly aid in reducing its numbers. The larvae and adults of Hippodamia con vergens Guer were fre- quently collected on plants infested with thrips, where they were busily engaged in feasting on the tender larvae of the bean thrips. On several occasions larvae of a predaceous thrips, probably /Eolo- t/trips fasciatus L., when collected were feeding on the larvae of the bean Fig. 11.—A hymenopterous parasite, Thripoctenus russelli: Adult. (Author's illustration.) Greatly enlarged. Mr. P. E. Jones informed the writer that at Lindsay, Cal., in 1910, he found a "nematode parasite working in the full-grown larvae of the bean ; A curious circumstance in connection with the observations made on the natural enemies of the bean thrips was the fact that in all of the predaceous forms noted the alimentary tract became bright red, undoubtedly due to the crimson or reddish pigmentation of the host. ARTIFICIAL CONTROL. CULTURAL METHODS. In the case of crops planted over large areas and difficult or im- possible to spray, such as beans, alfalfa, or cotton, cultural methods offer the most hope as a remedy for the bean thrips. Where this insect threatens injury it is recommended that these methods be used so far as possible. It is very important that the crops be given. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Entomology. Washington : G. P. O.
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