654 THE MONTHLY BULLETIN. 



on the inside of gunny sacks that had contained bell peppers, and, as a 

 result of this finding, refuse to release from the docks any material 

 arriving from Hawaiian territory packed in old or used sacks. All 

 such material must be emptied out, repacked in California sacks, the 

 original sacks cut in four pieces, sent to the incinerator and burnt 

 before the material is released by the quarantine officers. 



If Hawaiian producers continue to seek a market in California for 

 such of their products as are at present immune from the attacks of 

 the Mediterranean fruit fly, California should insist upon an official 

 record that every shipment of all such products, from the time they 

 were cut in the field, through all the processes of packing, hauling and 

 storing, had not been in the immediate vicinity of any material infested 

 with the Mediterranean fruit fly. 



No one comprehends more clearly than the writer that laws, rules or 

 regulations made in California are not susceptible of enforcement in 

 Hawaii, but the fact remains that in this particular instance, although 

 California failed to take advantage of this position at the outset, the 

 State is still master of the situation and can always decide as to what 

 products shall enter this port. 



THE RED HUMPED CATERPILLAR. 



{f?cMzura concinna S. & A.). 

 Order — Lepidoptera. Family — Notodontidae. 

 By B. J. VosLER, Assistant Superintendent, State Insectary. 



Summary. 



1. Considerable damage is often done during this season of the year 

 by the red-humped caterpillar on walnut, apple and allied plants. 



2. The work of this insect consists in the stripping of the leaves 

 from the branches of its host plant. 



3. The larva is easily recognized by the coral-red hump on the fourth 

 segment (first abdominal segment). The head is of the same color and 

 the body striped with slender bands of black, yellow and white. There 

 are two rows of prominent black tubercles along the back and shorter 

 ones on the sides. 



4. The pest is abundant during June, July, August and a part of 

 September. 



5. It is distributed over practically the whole United States, but 

 seems to be confined to the central portion of this State. 



6. Control measures consist in hand-picking on small trees and by 

 the use of arsenical sprays in large orchards where the former pro- 

 cedure is impracticable. 



7. Natural enemies are abundant and are important factors in the 

 control. 



Injury. 



The damage caused by the insect varies considerably ; sometimes the 

 entire trees are defoliated, and then again just one small branch is 

 attacked, the insect disappearing before all the leaves have been con- 

 sumed. This latter appears to be the case around Sacramento on wal- 

 nut trees, where only a few branches on the trees were defoliated, the 

 injur}^ done being of little economic importance. 



