THE COMMON MEALYBUG IN CALIFORNIA. 15 



i'. Where there is a light general infestation. 



A. Where no trees are severely infested. 



1. Pick navel fruit, including all culls and off bloom, before March 1. 



2. Band trees with sulphur-sticky mixture, preferably in February or 



March. Free trees of ants. 



3. Introduce large colonies of the four most useful insect enemies, 1 if 



these are not present in noticeable numbers. This should be done 

 preferably in March or April, but introduction can be continued 

 throughout the season, if necessary. 



4. Inspect weekly for ant reinfestation. 



5. Spray with water during summer, if infestation becomes severe. 



B. Where there are a few severely infested trees in an orchard otherwise 



lightly infested. 



1. Such trees should have the infestation greatly reduced during the 

 month of February, either by spraying with cresolated or soap- 

 powder emulsion or by fumigation under a gas-tight tent. After- 

 wards they can be handled like the rest of the orchard, as ex- 

 plained in A above. 

 3. Where there is severe infestation. 



A. Treatment of navels, grapefruit, and lemons. 



1. Navels and grapefruit. Pick all fruit, including culls and off bloom, 



before treatment. Leave culls and off bloom on the ground. 

 Lemons. Pick all marketable fruit before treatment. 



2. Prune heavily for spraying, with the lowest branches at least 1 foot 



above the ground. 



3. Following removal of fruit, spray with cresolated or soap-powder 



emulsion, or fumigate under a gas-tight tent, preferably in 

 February. 



4. 5, 6, 7. The same as for A 2, 3, 4, and 5, respectively, in section 2. 



B. Treatment of Valencias. 



The procedure is the same as for navels, grapefruit, and lemons, 

 except that the fruit is not picked, while the spraying should be done 

 with cresolated distillate emulsion. 



TREES IN HOUSE LOTS. 



1. Pick all fruit during the winter. 



2. Prune heavily and keep free from buildings, other plants, etc. 



3. Fumigate with eradication dosage under gas-tight tent if available. 



Otherwise spray heavily with cresolated or soap-powder emulsion. 



4. Band with sulphur-sticky mixture and keep free of ants. 



5. Spray frequently with water if living insects continue on trees. 



PREVENTING SPREAD THROUGH PICKING BOXES AND BY PICKERS. 



The present localization of the common mealybug renders advis- 

 able the adoption of some means to prevent its spread to new 

 regions through such controllable agencies as picking boxes and 

 picking sacks. Picking boxes which have been known to carry fruit 

 infested with the mealybug should be treated before use in uninfested 



1 Sympherobius californicus, 8. 6ar6eri, Hyperaspis lateralis, and Cryptolaemu* mon 

 trouzieri. 



