Volume IX 



APRIL, 1922 



No. 1 



THE CONTROL OF THE GREENHOUSE WHITE FLY 



(ASTEROCHITON VAPORARIORUM) WITH NOTES 



ON ITS BIOLOGYi. 



By LL. LLOYD, D.Sc. (Leeds), , 

 Lately Entomologist at the Experimental and Research Station, Cheshunt. 



(With 5 Text-figures, 2 Diagrams and Plates I and II.) 



CONTENTS. 



1. Introduction 



2. Acclimatisation . 



3. Food plants 



4. Habits of adults . 



(1) Length of life . 



(2) Fecundity 



(3) Mating . 



(4) Parthenogenesis 



5. Development 



(1) Egg . . 



(2) Scale 



6. Occurrence of A. sonclii 



in England . 



PAGE 



1 

 1 



4 

 5 

 6 

 6 



7 



10. 



Kotinsky 



Economic importance . 

 Control. .... 

 Fumigation .... 



(1) Naphthalene 



(2) Tetrachlorethane 



(3) Tobacco preparations 



(4) Cyaniding 



(5) Poster on Cyaniding Tomato 



Houses 

 Summary .... 

 References .... 

 Explanation of Plates . 



PAGE 

 16 

 17 

 18 

 18 

 20 

 21 

 21 



31 

 31 



32 



32 



15 



1. INTRODUCTION. 



The classification of the Aleyrodidae has been recently revised by 

 Quaintance and Baker (i) who have referred Alei/rodes vaporariorum 

 Westw. to the genus Asterochiton Maskell. The insect, popularly known 

 as the Greenhouse White Fly, or Snow Fly, is thought to be a native of 

 Brazil, but is now widely distributed. Its fecundity and polyphagous 

 habit have rendered it one of the worst greenhouse pests and it is 

 responsible for the loss of large sums every year in the British Isles. 



2. ACCLIMATISATION. 



In England it breeds freely in the summer out of doors on a wide 

 variety of plants, shrubs and trees in the neighbourhood of infested 

 greenhouses. The vast swarms found around these in the summer and 



^ A grant in aid of pul)li('ation has been received for this communication. 

 Ann. Biol, ix 1 



