. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 35 ^'acant spaces could be seen extending sometimes 10 or 15 feet down a row and covering an area from 2 to 5 rows Avide. Those few injured beets that had survived the attack were dry, ahnost lifeless., the leaves being small and the root of no value. Upon reaching the Santa Ana Valley and neighboring beet regions in southern California, especially at Chino, the work of this insect became more common and the damage in places was quite severe. The owners attributed the loss to plant lice and cut worms, but a very
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 35 ^'acant spaces could be seen extending sometimes 10 or 15 feet down a row and covering an area from 2 to 5 rows Avide. Those few injured beets that had survived the attack were dry, ahnost lifeless., the leaves being small and the root of no value. Upon reaching the Santa Ana Valley and neighboring beet regions in southern California, especially at Chino, the work of this insect became more common and the damage in places was quite severe. The owners attributed the loss to plant lice and cut worms, but a very slight examination was sufficient to show that the beets had been attacked by some borer, and that Avork on them was still in progress. At Huntington Beach, near Los Angeles, and at Chino, the larvae causing the injury were found in several fields, and at the latter place moths, which later proved to be the adult form of this phycitid borer, were rather common in one field on the beet-sugar company's ground. From examination of the beets it is evident that the young larva at first works on the beet just be- low the bases of the leaves, eating through the outer skin and either boring directly into the beet or working its way around the crown beneath the epidermis, thus making a swollen line that has the appear- ance of a mine, often much like early work of Pegomya incina and similar species mining in leaves. As the larva grows in size it forces its wa}'^ -farther and farther into the beet until it reaches the center, when it may bore directly downward or pass on througji the beet and then return and feed up and down inside the root. In all the gal- leries examined I found more or less evidence of a silken tube. Those of the older larvte that were feeding on the outside of the beet had constructed tubes covering their operations and ])rotecting them from contact with the soil. Sometimes these tubes extended lor a considerable distance away from the beet. These tubes are very frag
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