568 INSECT 'PESTS OF FARM, GARDEN AND ORCHARD 



Control. As the adults hibernate over winter in the bark 

 the treatment advised for the pear leaf blister-mite furnishes the 

 best means of control for the psylla, and winter treatment is 

 absolutely essential for its successful control. Otherwise, the 

 best time to spray is in the spring just after the eggs have hatched 

 and before the nymphs have secreted much honey-dew. If 

 winter or spring spraying has been neglected, the trees should be 

 thoroughly sprayed with " Black-leaf 40" one to 1000 with soap 

 added. Spraying should be done after a shower, which will wash 



much of the honey-dew off, 

 as the chief difficulty in sum- 

 mer spraying is to reach the 

 nymphs through the thick 

 coating of honey-dew with 

 which they are covered. Ob- 

 viously the spray should be 

 applied with considerable 

 pressure in a coarse spray. 



The Pear Thrips* 



The pear thrips has been 

 known as an enemy of pears, 

 plums, prunes, cherries and 

 other plants in California 

 since 1904 and within the 

 last decade has been reported 

 from New York, Pennsyl- 

 vania, New Jersey and Mary- 

 land. It feeds on fruits, 

 503. The Pear Thrips (Tceniothrips budgj fl owe rs and leaves and 



causes injury aggregating at 

 least a million dollars an- 

 nually in California. The 

 insect is not markedly dif- 



THE PEAR THRIPS ITAENIOTHHIPS i 



FIG. 



Pyri Daniel). 1. Adult. 2. 

 3. First-stage larva. 4. Full-grown 

 larva. 5. Pupa, first stage. 6. Pupa, 

 last stage. 7. Side view of head show- 

 ing mouth parts. All greatly enlarged. 

 (After Foster and Jones, I.e.) 



ferent, to the casual observer, from the several other species of 

 thrips discussed elsewhere in this volume. Adults appear on the 

 fruit buds early in the spring and lay their eggs on fruit and leaf 



* Taeniothrips pyri Daniel. Family Thripidce. See Foster and Jones, 

 Bulletin 173, U. S. Dept. of Agriculture. 



