18 



The present report has been compiled with the object of informing 

 the public of the status of this pest and of tlic work that has been done 

 in Texas towards its eradication since its first discovery there in 1917. 

 The life-history and habits of this moth are described, with illustrations 

 of its work, tables showing the damage done to cotton, and maps 

 showing the cotton growing comitrics of the world as well as the distri- 

 bution of the insect. A short account is given of other cotton pests, 

 and a brief notice of some insects that might be confused with 

 P. gossypiella. The parasites of the pink bollworm are also discussed. 



The legislation passed to prevent the importation of the pest into the 

 United States, and the quarantine and other regulations that have 

 been passed since its appearance, are recorded in full. 



The conclusion drawn from the work and its results is that although 

 P. gossypiella has actually existed in Texas for the past few years, it 

 seems to be entirely under control at the time of writing. Attention 

 has been drawn in the course of the work to other pests of cotton and 

 cotton seed that require the immediate attention of entomologists. 

 It is believed that no method other than strict quarantine measures will 

 entirely eradicate a thoroughly established infestation of P. gossypiella. 

 The study of alternative food-plants has not yet been completed, but 

 there are indications that if successive generations of the bollworm are 

 able to develop on other plants than cotton, such plants are few in 

 number. 



The Federal Government has helped very considerably in Texas 

 towards the eradication of P. gossypiella with a large force of com- 

 petent men and the expenditure of a considerable sum of money. 

 The author suggests that it would be well for the State Legislature to 

 make a sufficiently large appropriation so that the burden will not all 

 fall upon the Federal officials. A grant made at the present time for 

 eradication of the pest and for preventing the introduction of new 

 infested material would obviously be much better than the expenditure 

 of large sums for remedial measures should the insect become established 

 in the United States. 



In an appendix, the pink bollworm situation during 1919-1920 is 

 discussed, and the latest resolutions for quarantine measures and the 

 recommendations of the Pink Bollworm Commission are given [see also 

 preceding paper]. 



DuTTON (W. C.) . Dusting and Spraying Experiments of 1918 and 1919.— 



Michigan Agric. Expt. Sta., East Lansing, Spec. Bull. 102, 

 March 1920, 50 pp., 20 figs. [Received 11th November 1920.] 



An account is given of the results of a series of dusting and spraying 

 experiments conducted during two seasons, including comparisons of 

 dusting materials, hme-sulphur solution, Bordeaux, dry hme-sulphur, 

 and lead, calcium, and magnesium arsenates. These materials were 

 used on apples, cherries, plums, peaches, currants and potatoes, for 

 the control of both insects and fungi. 



Apple scab and chewing insects on apple were satisfactorily controlled 

 by the use of dusting materials. The results were equal to or better 

 than those obtained with dilute lime-sulphur and lead arsenate. The 

 dusting method, however, is recommended as supplementaiy to 

 spraying, not as a substitute for it, as no dusting material has been 

 developed that will completely control scale-insects. 



Dusting mixtures composed of sulphur, lead arsenate and tobacco 

 dust caused no injury to plum foliage including Japanese varieties. 



