THE CITRUS MEALY BUG 313 



Citrus medica (Citron). — Baker & Essig. 



Citrus limonum (Lemon). — Baker & Essig. 



Coleus sp. — In greenhouse. — Baker & Essig. 



Cucurbita pepo (Pumpkin). — Baker & Essig. 



Cyperus alternifolius. — In greenhouse. — Ehrhorn. 



Erythea edulis (Guadalupe Is. Palm). — Essig. 



Euphorbia pulcherrima (Poinsettia). — Baker & Essig. 



Filicales (Ferns). — Baker & Essig. 



Fuchsia sp. — Baker & Essig. 



Nerium (Oleander). — Essig. 



Paeonia sp. (Penny). — Baker & Essig. 



Passiflora violacea (Purple Passion Flower). — In greenhouse. — Essig. 



Strelitzia regina. — Essig. 



Strelitzia gigantea. — Essig. 



Solanum douglasii. — Baker & Essig. 



Tradescantia multicolor (Variegated Wandering Jew ) — In greenhouse. — 



Essig. 



Host Plants Outside of California, Not Given in Above List. 

 Nicotiana tabacuni (Tobacco). 

 Coffea arabica (Coffee). 

 Gossypium sp. (Cotton). 

 Hedera helix (English Ivy). 

 Ipomoea. sp. 



Solanum jasminioides (Jasmine). 

 Habrothamnus sp. 



ENDURANCE. 



We have seen in the life-history of the mealy bug that its enduring 

 c|ualities are unusually great and that it is able to reproduce its kind under 

 the most extraordinary circumstances. In order to control it in the green- 

 house, in the orchards, or in the nurseries, it is important to know something 

 of these qualities so as to act accordingly. We cannot intelligently cope 

 with a pest until we understand every phase of its life history. 



Lack of Food. — Starvation hastens development and reproduction. Un- 

 der normal conditions an adult female might not deposit her eggs for some 

 weeks, but if taken from the food supply would begin egg-laying within 24 

 hours and will retain vitality enough to continue to lay eggs for at least 

 two weeks. Under such conditions life, from the time the female is first 

 removed from food until the last egg is hatched, may be retained for 30 

 days. In case of the apparently half-grown females, 70% are able to reproduce 

 exactly in the same manner as the full-sized adult, the only difference being 

 that the smaller form is not able to produce as many eggs as the large ones. 

 These facts simply mean that a female from the time it is half grown to 

 maturity, if carried into the orchard on clothing, boxes, ladders, etc.. has 

 30 days in which to find lodgment upon a tree or to produce young which 



