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The peach twig borer, Anarsia lineatella Zeller, sometimes called the peach worm, annually damages peach, apricot, nectarine, prune, and plum orchards in Utah. Many buds and twig terminals are destroyed each spring by the overwintered generation of partially grown larvae. These emerge from their winter quarters almost as soon as host trees begin their spring growth. From the time the fruit becomes about half grown until it is harvested, later generations of twig-borer larvae feed on it causing irregular, gummy cavities which make it unfit for market.

In order to work out a control program for any insect, its life history must be known. Consequently the first part of this study was made to obtain specific information on the biology of the peach twig borer as it occurs in Utah, and second, to determine the effectiveness and best time to apply the various insecticides for the control of this pest. The authors studied the life history of the borer during 1936 and 1937 in Davis County and during 1941 in Washington County. They studied methods of control in the Brigham-Perry district of Box Elder County from 1940 to 1943, inclusive.



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