132 



species of grasses found by experiment to be infested by L. simplex 

 is given. Experiments still show that drainage is the safest method 

 of control, and it should be begun from 2| to 3 weeks after the first 

 flooding and continued for a fortnight ; a shorter period will not kill 

 the larvae and a longer one will injure the rice. 



Weiss (H. B.). Agrilus politus, Say, infesting Roses. — Jl. Econ. 

 Entom., Concord, N.H., vii, no. 6, December 1914, pp. 438-440. 



Infested roses from New Jersey are stated to have been attacked 

 by Agrilus politus, Say, which has hitherto only been recorded as 

 having been bred from willow. Many of the injured roses had been 

 imported from Holland, but no such infestation is known on roses 

 there. The larva makes innumerable galleries in the sap-wood, 

 travelling irregularly up the stem for from 3 to 6 inches where it 

 constructs a pupal chamber ; the outward sign of injury is a gall over the 

 galleries, while the leaves turn yellow and wither. At one nursery in New 

 Jersey, £40 worth of roses were destroyed by this insect ; at another, the 

 services of two men were required for over two days to cut and burn 

 infested stock. Rosa ritgosa, on which standard roses are usually 

 grafted, seems to be especially attacked, though other species were also 

 found infested. Infestations have been recorded from New Jersey, 

 Pennsylvania, and New York. Cutting and burning of infested stems 

 is the only method of control. 



EwiNG (H. E.). Some Coccinellid Statistics. — Jl. Econ. Entom., Con- 

 cord, N.H., vii, no. 6, December 1914, pp. 440-443, 1 table, 2 figs. 



Plant lice, especially Phorodon humuli, Schrk., Aphis brassicae, L., 

 and A. viburni, Scop., are very destructive in W. Oregon ; statistics 

 on the relative numbers ot different Coccinellids found feeding on the 

 above three species, have been collected as a preliminary to introducing 

 other beneficial species. All adult beetles that were present in the 

 following situations were collected : Feeding on P. humidi, on hops ; 

 on A. viburni, on thistles and on lamb's quarters [Chenopodium 

 album ?] ; on ^. brassicae, on kale and vetch. The distribution of each 

 of the following Coccinellids in these situations was then noted : 

 Hippodamia spuria, H. convergens, H. parenthesis, Coccinella 9-notata, 

 C. trifasciata, C. trans versognUata, Cycloneda sanguinea and Adalia 

 bipunctata. It was found that H. convergens, Guer., forms the greater 

 part of the Coccinellid population in each situation ; large numbers ot 

 C. sanguinea, L., were found on P. humuli (the hop aphis) while in 

 other situations this species was rare, being entirely absent from 

 A. brassicae, on kale, and from A. viburni. Scop., on thistles. H. spuria 

 was found to be second in numbers in four of the situations ; with 

 the exception of C. trifasciata, Cr., when feeding on P. humuli, no 

 other species is found in such numbers as to equal or exceed 5 per cent, 

 of the population in any one of the situations. Similar conditions 

 prevailed in the vetch field, where H. convergens formed over 87 per 

 cent, of the population, H. spuria came second, while C. sanguinea, 

 so common in the hop fields, occurred only to the extent of about 

 ^ per cent. 



