10 THE MONTHLY BULLETIN. 



added an equal amount of dehydrated lime. The applications are 

 preferably made early in the morning when the foliage is damp and 

 the dust readily adheres to it ; however in large groves it is often impossi- 

 ble to delay for such favorable conditions. In cold weather the dry 

 sprays do little or no good, due to the slow liberation of the fumes. 



During the past few years liquid sprays of the commercial lime- 

 sulphur have met Avith great favor and promise to completely do aw^ay 

 with the dust sprays. The commercial product is reduced to from 2 to 

 2^ per cent and applied as a fine mist under a pressure of from 150 to 

 200 pounds. Care must be taken not to use the spray stronger than is 

 absolutely necessary, for in some cases severe burnings occur to young 

 lemons. 



Applications of both the dry and liquid sprays should be made as 

 soon as the spiders appear in any considerable number. 



Natural Enemies. — Natural enemies pla^^ an important part in the 

 control of the citrus red spider and are often responsible for keeping 

 its numbers so small as to do little damage. Conventzia hageni Banks, 

 the green lacewing (Chrysopa calif ornica Coq.) and the brown lace- 

 Mdngs (Symplierohius angnsfus Bks. and Hemerohiiis pacifimis Bks.) 

 are important enemies belonging to the order Neuroptera. The 

 jninute black ladybird beetles {Stethorus vagans and S. picipes), a 

 staphylinid beetle (Oligota oviformis Casey), the thrips {Scolothrips 

 sexmaculatus Perg.), the larvee of a fly (Arthroconodax occidentalis 

 Felt) and the carnivorous bug {Thriphleps insidiosus Say) prey upon 

 the red spiders. 



