235 



pest, has made it imperative to practise remedial measures against 

 both of these moths. The usual methods for combating an outbreak, 

 as well as preventive measures, the value of which is emphasised, are 

 described. 



Newell (W.). Report of the Plant Commissioner for the Biennium 

 ending 30th April 1920, and Supplementary Reports. — Qti-ly. Bull., 

 Florida State Plant Bd., Gainesville, v, no. 2, Januarv 1921, 

 pp. 37-126. 



The main lines of work indicated in the last biennial report [R. A.E., 

 A, vii, 213] have been continued. The quarantine and other rules 

 passed by the Florida Plant Board are quoted, and the work of the 

 quarantine department is reviewed and summarised in a list including 

 all pests intercepted, with their place of origin. As exports of cotton, 

 cotton seed, etc., to the south have been made from various parts of 

 Louisiana that have been found infested with the pink bollworm 

 [Platyedra gossypiella], further restrictions have been made in this 

 respect. Other important work of the quarantine department has 

 been the prevention of additional introductions of the mosaic disease 

 of sugar-cane and of gipsy moth [Porthetria dispar] and brown-tail 

 moth [Nygmia phaeorrhoea] and other pests and diseases. 



Nursery inspection has been thoroughly carried out. To prevent 

 the spread of cottony cushion scale [Iceyya piirchasi], all food-plants 

 coming from infested localities are required to be scrubbed with an 

 insecticide before removal. The Australian Coccinellid, Novius 

 cardinalis, is also being distributed in large numbers for its control. 

 The cultivation and distribution of the fungi, Aschersonia aleurodis 

 and A. flavocitrina, for the control of Dialenrodes citri (citrus white- 

 fly) and D. citrifolii {Aleurodes nubifera) (cloudy-winged whitefly) 

 respectively, have been continued. 



Xylomyges eridania (semi-tropical army worm) threatened severe 

 damage to the castor bean, cotton and sweet potato crops, but the 

 invasion was checked by the efforts of the Plant Board. The sweet- 

 potato weevil [Cylas formic ari us] has been prevented from spreading 

 by the strict enforcement of quarantine rules, destruction of its fodd- 

 plants (particularly morning-glory [ Ipomaea]), the use of weevil-free 

 slips for planting, and fumigation of sweet potatoes before removal 

 from any weevil-infested area. The eradication measures described 

 in the last report [loc. cit.] were repeated. 



The eradication of the banana root borer [Cosmopolites sordidus] 

 has progressed so satisfactorily that, apart from a few isolated cases,, 

 no infestations are known to occur in the State at the present time. 

 To prevent the introduction of the black fly [Aleurocanthus icoglumi] 

 into Florida, fruit arriving from localities known to be infested with 

 this pest is not allowed to enter if the consignment includes any 

 leaves, twigs or branches, unless such consignment has been subjected 

 to fumigation with hydrocyanic acid gas. Platyedra gossypiella 

 (pink bollworm) has not as yet appeared in Florida, but the situation 

 in Texas renders the continuation of strict precautions necessary. 

 It is hoped to obtain a satisfactory degree of control of the boll weeviL 

 [AntJionomiis grandis] along new lines. 



(2758) R 2. 



