66 

 TREATMENT. 



The best treatment for Thrips is copious syringing 

 with cold water, but when the attack becomes very bad 

 tobacco wash may be used. 



Under glass fumigation with tobacco paper or cloth, 

 repeated two or three times is the best plan. 



In either case the Roses should be washed next day 

 with plain water. 



Red Spider (Tetranychus sp.) 



No requests have ever been received for information 

 or any reports of damage done by Red Spider on Roses 

 out of doors. Under glass the well-known Tetranychus 

 telarius now and again becomes troublesome. This 

 Acarus a mere moving speck varies in colour, some 

 are dull green, some semi-translucent, some red. It can 

 at once be told from any of the insect pests by having 

 eight legs. They live on the leaves, usually the under 

 surface in colonies and spin a fine silken web, beneath 

 which they lay their round eggs. The young are six- 

 legged, but otherwise like the parents. The result of 

 their working is that they cause first a marbling of the 

 leaf, then it turns yellow and dies. 



Under glass they may keep on breeding all the year 

 through, and may get on to other plants. Red Spiders 

 breathe through their skin, and they are protected by 

 their webbing in the case of the Tetranychus. In 

 consequence they are very difficult to destroy. 



TREATMENT. 



Out of doors there is no better plan than two or 

 three sprayings with liver of sulphur at an interval of 

 a few days, best perhaps at ten days interval. 



