382 



PEAR GROWING IN CALIFORNIA. 



reddish spots on the twigs and fruit. An examination of these spots 

 will reveal the presence of the little gray-colored or black scale in the 

 center. This scale breeds so rapidly that when nothing is done to 

 control it it may kill portions of trees, if not entire trees. It has never 

 been seen by the writer abundant enough in California to cause great 

 concern. 



Control. 



If control measures are found necessary Formula No. 1, 2 or 7 

 should be used. 



FIG. 174. Severe injury to fruit and twig by San Jose scale, Aspidiotus perniciosiis. 

 RED-HUMPED CATERPILLAR (Schizura concinna). 



In the fall of the year defoliation of portions of pear trees is some- 

 times noticed and is due to the presence of the red-humped caterpillar, 

 a dark colored larva with coral-colored markings just back of the head. 

 The eggs from which these larvae come are deposited by a moth on the 

 twigs of the pear or other trees. Upon hatching, the larvae colonize and 

 confine their attack usually to a small portion of the tree. 



Control. 



Often in the evening or early morning the removal of a twig upon 

 which the larvae are clustered is all that is necessary to destroy the 

 whole colony. In cases where the infestation is bad use Formula No. 12. 



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