thp: more important aleyrodid^. 93 



Custard apple {Ahoik/ spp.). — In Demerara A/ioiu/ )iiuric(ifii and 

 .1. squamosa^ and in Trinidad .1. reticulata^ are often seriously 

 infested with Aleurodiciis a/wiio' ^Morgan, and this same species has 

 been rej^orted on Anona from Pernambuco, BraziL This species is 

 remarkable from the large amount of cottony substance secreted, 

 the under surface of badly infested leaves being- thickly covered with 

 it (see PL VII, fig. 2). ^1. nvii^ahilis Cockerell occurs on Anona sp. in 

 Mexico, and Aleyrodes lacerchv Signoret is recorded from Annua 

 si/lratica, the locality not being stated. 



Straavberry. — Aleyrodes packardi Morrill is troublesome to straw- 

 berries, according to Morrill, and occurs in Ohio, Kentucln^, south- 

 eastern New York, and Connecticut. Until the investigations of 

 Doctor Morrill this species had been referred to .i. vaporarioriim 

 AVestwood, which it resembles. This and the greenhouse Aleyrodes 

 (^i. vaporarionnn) are the subject of a valuable paper by Morrill 

 published as Technical Bulletin Xo. 1 of the Massachusetts Hatch 

 Experiment Station. .1. fernaldi Morrill is also recorded from straw- 

 berry, though more abundant on Spirea\ In Europe A. fraxjariw 

 Walker occurs on strawberry, according to Walker, in myriads during 

 July, but in France, as stated by Signoret, it is less numerous. 



Cabbage. — In Europe Aleyrodes hrassica^ Walker has long been 

 known as more or less injurious to cabbage, kale, and other members 

 of this family. According to C. W. Dale, and reported by J. AY. 

 Douglas, it is common on the indigenous wild cabbage which gTows 

 on the coast of the Isle ofPurbeck, and the species is not to be 

 regarded as imported and naturalized on cabbage cultivated in 

 gardens. In Brazil, State of Sao Paulo, Aleyrodes youngi Hempel 

 infests cabbage, the injury being considerable, as the infested leaves 

 become yellow, wilted, and covered with a white powder, and are 

 thus rendered unfit for use. 



Greenhouse plants. — Several species of aleyroclids are known to 

 infest plants in greenhouses, notably Aleyrodes raporariormn West- 

 Avood, which in some sections of tlie North, as Massachusetts and Con- 

 necticut, constitutes a serious clraAvback to the growing under glass of 

 such A^egetables as tomatoes, cucumbers, and melons, and to such flower- 

 ing plants as Ageratnm^ Lantana, and heliotrope. This species is a 

 A'ery general feeder, attacking plants representing several botanical 

 families (see PL VII, fig. 3) . An undetermined species having banded 

 Avings infests tomatoes and other A-egetables under glass, and to some 

 extent out of doors, in Florida. Aleyrodes nephrolepidis Quaintance 

 occurs on a fern, Xephrolepis, thus far reported only from the con- 

 servatory of the Pennsylvania State College, Avhere it evidently has 

 l>;'en introduced. According to Professor Butz the adults Avere very 

 abundant, flying around in the conservator5^ Other aleyrodids occur- 

 ring on ferns are Aleyrodes flirhnn Goldi, on Asplevivm eimeatnin. 



