SLUGS AND BEETLES 553 



Pear and Cherry Slug. A small, slimy, dark-colored worm, with 

 the fore part of the body notably larger than the rear part, eating 

 the upper surface of the leaves but not usually making holes 

 through them. The insect can be checked by throwing fine road 

 dust or air-slacked lime over the tree, which cakes upon the slime 

 of the worm and destroys it. On a large scale an arsenate of lead 

 or Paris green spray is best. 



Saw-Fly Worms. There are several larvae of saw-flies which 

 do much injury to pear trees, currants, etc., by eating the whole 

 leaf substance except the larger ribs. The worms are small, not 

 slimy like the pear slug, the one infesting the pear being about half 

 an inch when fully grown. Its general appearance and work are 

 shown by the engravings. The most available remedy is an arsen- 

 ate of lead or Paris green spray. 



Large Caterpillars on Grape-vines. f The grape-vine is often 

 seriously injured by the attacks of very large leaf-eating worms two 

 inches and upwards in length, sometimes with a large horn, or 

 spine, sometimes without. They are larvae of several species of 

 Sphinx moths or hawk-moths. The worms when new hatched can 

 be killed by an arsenical spray or by hand-picking. The numbers 

 of worms can be reduced by killing the large moths which are 

 abundant at nightfall on beds of verbenas, or other garden flowers. 

 These worms are related to the other large caterpillars which feed 

 on tobacco, tomatoes, etc. 



Leaf Eating Beetles. There are many beetles, large and small, 

 which infest grape leaves. They can all be reduced by the use of 

 arsenate of lead or Paris green, or those which drop to the ground 

 when disturbed may be collected in large numbers on sheets spread 

 below. 



The most notable of these because of its evil work in the cen- 

 tral part of the State, and because the grub destroys the roots of 

 the vine causing it to be called the "grape root worm," and the 

 beetle riddles the leaves and young fruit. It is Adoxus vitis and 

 a special study of it has been made by Professor H. J. Quayle, of the 

 University Experiment Station, the results of which are published 

 in Bulletin 195 of the station and remedies suggested. Our pictures 

 will enable the reader to recognize the beetle and its work. The 

 beetle is about one-fifth of an inch in length and is black or brown. 



tSee Bulletin 192, University of California, Agricultural Experiment Station. 



