COMMON THRIPS. 35 



square in the face, and, if possible, to keep it within 

 reasonable bounds. Only a strict co-operation on the 

 part of the growers, coupled with such advice as can 

 be tendered, can hope to bring about the desired results. 

 Where gardens or orchards are surrounded by Cape Weed 

 or even Hypocharis-infested paddocks, the exclusion of 

 thrips from the gardens would appear to be hopeless, and 

 in such cases smoking out where practicable should be 

 resorted to. 



When the buds are just bursting is the time for an 

 occasional spraying with a weak material, such as deter- 

 rents, but in the case of roses, when the thrips have once 

 got into the buds, the latter may as well be cut off and 

 burnt, as the blossoms are sure to be a failure. It is pitiful 

 to see the devastation that these tiny beasts will sometimes 

 cause in a rose garden ; still, there are some roses which 

 appear to be much less liable to attack than such kinds as 

 those of the splendid Cochet type, so that future genera- 

 tions may see a hardier type of thrip -resisting roses. 



In England, gardeners depend on a liberal use of syringing 

 with water, but here, after a drenching storm of rain, the 

 thrips are as bad as ever. 



Professor Webster remarks that this pest is increasing 

 rapidly in Ohio (U.S.A.), as extensive onion-growers have 

 recently found out to their cost; it is a serious obstacle 

 to successful onion culture, especially in dry summers. 

 Onion-growers will therefore need to be on the look-out ; if 

 the pest be noticed, the fact should at once be reported to 

 the Entomologist. 



B 2 



