466 EXPERIMENT STATION RECORD, (Vol.37 



mis and all the green substance of the central layers of the leaf, whereas the 

 adults eat holes here and there entirely through the leaves, rarely destroying 

 the whole leaf. The young pods may be attacked, holes being scraped in their 

 sides, or an occasional flower eaten. 



The species was first described from Mexico in 1851 and occurs in Arizona, 

 Colorado, New Mexico, Texas, and Utah. There are two broods of the bean 

 beetle each year in the southern part of New Mexico, where the life-history 

 studies were conducted. The hibernated adults oviposit from June 15 to August 

 1. The first-brood larvje were found Irom June 19 to August 23; the first-brood 

 pupae from July 5 to August 28 ; and first-brood adults from July 10 throughout 

 the season, of which some may hibernate. The seoond-hrood eggs are found 

 from July 16 to the end of the season ; second-brood larvje from July 20 to the 

 end of the season ; second-brood pup£e from August 5 to the end of the season ; 

 and second-brood adults from August 10 on, in which stage they hibernate. 



The eggs are deposited in clusters, as a rule not contiguously, on the under- 

 side of the leaves, 46 being the average number of eggs per cluster for 39 clus- 

 ters counted. The maximum egc production among 8 females observed was 

 754 in 14 clusters, the minimum was 93 eggs in two clusters, and the average 

 291 eggs per female. The average period of incubation was 5.8 days, with 4 

 days as the minimum and 9 days the maximum. The larval period (4 instars) 

 required an average of 16.8 days for the first brood, with a maximum of 21 and 

 a minimum of 15 days; for the second brood an average of 15.7 days, with a 

 maximum of 19 and a minimum of 15 days. The pupal period averaged 4.7 days 

 for either brood, with ."> days as a maximum In each, while the minimum for the 

 first brood was 3 days and for the .second 4 days. The average total time from 

 egg to adult was 2.5.9 days for the first brood and 25.4 days for the second 

 brood ; the shortest time was 22 and the longest 28 days. 



It is pointed out that injury may be reiluctHl to a minimum by coopi-ration In 

 the use of preventive measures of control. Including time «>f planting, rotation, 

 clearing of fields, etc. Attention is called to the fact that a gain of from one 

 to two weeks in planting is of considerable Importance at the crucial point 

 of the infestation. But few natural enemies have been observed. Preliminary 

 experiments with arsenicals and blackleaf 40. briefly reported. Indicate that 

 lead arsenate may be <»f value. 



The 1916 tests of sulphur-arsenical dusts against the strawberry weevil, 

 T. J. Hkadlee {S'eir .ferseii StuK. Circ. 65 (/J^/7). pp. S-7, fig. /).— Tiio remark- 

 ably efficient results obtained from the use of mixtures of arsenate of lead and 

 sulphur for the strawberry weevil during 1915 (Yl. S. R.. 35, p. .301) led to more 

 extensive tests in Atlantic. ruml)erland, and Burlington Counties during 1916. 



The results obtaineil on a representative farm in Atlantic County on which 

 careful records were kept, presented in tabular form, show net returns at the 

 rate of more than $100 per acre or a maxinmm increase of 200 per cent. The 

 mixture of one part of lead arsenate to five parts of sulphur, while a little less 

 effective than the 1: 1 mixture, was much the better from the standpoint of net 

 returns. It is shown that neither sulphur by itself nor arsenate of lead used 

 alone is anywhere nearly so effective as the two combined. This is thought to 

 be due to the fact that while neither substance alone flows fretMy through a 

 powder gim a mixture of the two does so readily, and thus permits the applica- 

 tion of a nmch more even and complete coating. Since careful examinations 

 again failed to reveal any considerable number of dead beetles on treated plats. 

 It Is concluded that the mixtures act as repellents. 



The year's experience with machinery for making applications is said to 

 have been largely unsatisfactory. Mention is made of a satisfactory hand sifter 

 which has been devised by T. Rizzotte, consisting of a common wire nose muzzle 



