Insects, etc., Injurious to the Vine. 



489 



this Bed Spider, the Tetmnychus, can at once be told from one of the 

 non- web- weaving Bryobias. The winter appears to be passed in two 

 ways under glass, namely, in the egg stage on the wood and buds, 

 but more usually as immature or mature mites under the skin of the 

 wood or in any convenient shelter. 



TREATMENT. 



This consists of either washing, dusting, or fumigating. 



Eed Spider strongly object to cold water, and frequent syringings 

 in an early stage of attack with plain water will often stave off attack, 

 but it is useless when any 

 amount of webbing has 

 been formed. Spraying 

 with liver of sulphur and 

 soft soap is generally of 

 benefit, but by far the best 

 method is fumigating with 

 sulphur. An old and ex- 

 cellent plan, if done care- 

 fully and at the exact 

 temperature (the knowledge 

 of which seems to be gained 

 only by experience), is to 

 paint the stove pipes with 

 flowers of sulphur. At 

 times damage is done in 

 this way, depending, it 

 seems, entirely on the heat 

 of the pipes and house. It is better to use sulphur fumes spread 

 by means of proper machines, such as that made by Campbell of 

 Manchester. 



Very inferior results have been obtained with hydrocyanic acid 

 gas, and sulphur fumigation seems to be the best remedy we yet have. 



FIG. 316. OVA OF KED SPIHER AND TRANSPARENT YOUNG 

 JUST HATCHING. 



(Greatly enlarged.) 



