548 EXPERIMENT STATION RECORD. [Vol.40 



" The larvfe make their first appearance at the beginning of May and are to 

 be found on the trees until the middle of June. In great abundance they occur 

 inside the calyx cup of the blossoms, lacerating its tender tissue and feeding 

 on the nectar. They are also to be found on the back of the leaves, shaded 

 from the sun, busily sucking the leaf juices. When at rest, they are generally 

 to be found ranged along each side of the midrib and chief veins. When the 

 larvae attack the young fruit in numbers they cause a ' russetting' of the skin 

 which is known as 'thrips scab.' They appear in maximum numbers from May 

 20 to June 5. The individuals remain on the trees for about three weeks before 

 they are fully fed." 



Control work in 1916 and 1917 shows that it can be readily controlled through 

 spraying twice before blossoming and once after. " Usually the first application 

 is made on a bright, warm day in spring after the buds have just begun to 

 burst. The second may be made in the week preceding the period of maximum 

 bloom. The third spray is directed against the larvae in the calyx cups and on 

 the leaves just after the fall of the petals. It has been demonstrated that for 

 the first application the b .its attend the us.' of mlsclble oil No. 2 in com- 



bination with nicotin sulphate. Whale-oil soap, also combined with nicotin 

 sulphnte, is the most suitable and economical for the second and third sprays. 



Lime-sulphur has been shown to posa SB \'i\ i r penetrative and spreading 



qualities, hence its potencj as :: controlling agent for thrips Is merely confined 

 to those Insects with which it comes into direct contact Therefore it should 

 only be used to replace the second and third application <>f whale-oil soap in 

 cases of li^lit infestation and where it has been found necessary to undertake 

 control measures for ' scab.' 



"On no account must it be Inferred thai the tirst application of miscible oil 

 can be dispensed with. Miscible oil, by reason of it- greater powers of pene- 

 trating the young buds, has been found to he the best remedial agent In the 

 first spraying. The use of whale oil soap at this time, whilst often satisfactory, 

 Is less effective than the oil." 



Control of the onion thrips. F. H. CHITTENDEN (U. B. D< ]>t. Apr., Farmer? 

 Bui. 1007 {1919), }>l' "'• ''"'*■ //! A summary of information on tl nion 



thrips, Including Its distribution, life history and habits, and methods of 

 control. 



Kerosene-soap emulsion and Bsh-Oil soap- applied as sprays afford some 

 relief, but nicotin sulphate i 10 per cent) used at the rate of g pint to 50 gal. 

 of water, plus 4 lbs. of soap, is considered th< besl direct remedy. The 

 author recommends that Spraying be begun as soon as the adult thrips can be 

 seen In any numbers or the characteristic whitening of the leaves is in evi- 

 dence, and that the sprays be applied under a pressure of at least 100 lbs. 

 Early cabbage and cauliflower should 001 he planted next to onion fields, for 

 they serve as host plants for the thrips. Fields should he cleaned up after 

 onion, cabbage, and related crops are harvested, a- the thrips continue to 

 breed on any living portion of these plants and on almost any kind of weeds 

 that remains in the field. After harvest the fields should be plowed as deeply 

 as possible and harrowed and again in the spring if onions arc to be grown 

 anywhere in the vicinity. The seed should be planted aa early a- possible and 

 quick-acting fertilizers applied. 



The possible spread of influenza through the bedbug. O. A. Friedman 

 (Med. Rec. I v. v.], ;/.•; (1919), No. i. t>i>- H-18).— The slmilarttj of Influents to 

 Sporadic typhus, an insect transmitted affection which has occurred for many 

 years in New York City where it is known as Brill disease, is pointed out. 



in countries where sporadic typhus is common, it Is frequently confounded 

 with Influenza iu adults and with measles in children because of the resplra- 



