- 509 - 
A SILK I'KKTLK (L upe.ro cle s sp,) 
Louisiono,. 0, 0, Sdcly (July 24); Abundant in- north-central Louisiana since 
ahout June 10, Snail nunhcrs of the adults a,ro parasitizod "by the fly 
Anedoria. luc tuo sa Meirl* 
ilLKALKA 
PEA APHID ( Macrosiphujn pi si Klfb.) 
Utali, G. E. Knovrlton (July 17) i Loss abundant than they were a fcv; weeks 
ago on alfalfa, and peas throughout northern pant of the Sta,te. (August 
2): Only noderately abundant to scarce iii nost northern Utah alfaAfa 
fields exanined recently, 
AIjPilLEA CATEEPILLilR ( Colias eurry’thcno Ddv,) 
iirizona., D, II, Parker (August 22); Adults firming over and hetwoen aAfalfa 
fields in the Salt Diver Valley in innenso nurhers. Motorists annoyed 
hy cars ovorheaAing du.e to butterflies lodged on ra,dia.tors, 
Utah, G. F, Knowlton (August 5)» Butterflies veip’- abundant around aAfalfa 
fields a,t Grantsville, (August l): Butterflies fU^ung in nodera.te 
abundance over alfaAfa fields at Iiowcll, (August 12); Dutterflies 
anc abundant at Mantua, in and around alfaUfa fields, 
California, A, S. Michelbacher (August 25 ); Serious outbreak in the north- 
eastern pant of the San Joaquin VaAlcy, In one field the nuaber of 
larvan collected to the 100 sweeps of an insect net exceeded 12,000, 
The field vms first cxar.iined on Jul"^ 29, and a.t this tine a very fev; 
of the larvae were infested with a wilt disease. On August 2, 75 per- 
cent of the lanvae had been killed by the v/ilt, and the ronainder v/ere 
infested. On August 6 the nunber of lanvae collected to the 100 sv/eeps 
was only 10, Uiit disease v/as present in ncank'' a,ll the infested fields 
and v/a,s a very inportant factor in reducing dajeage. The larval parasite 
A-oantcles flaoviconchan Riley was slow' in^ developing; however, by 
August 6 nost of the snail alfaAfa butterfly larvae in nost of the . 
fields wera.-paranitisod. The percentage Of larvae panasitiezed in nany 
fields exceederd- SO perdent. On August l4, in sone fields, the nunber 
of snail lanvae parasitized rea.ched nearly 100 piercent. In the north- 
western portion of the San Joaquin Valley there was no large second 
generation of alfalfa weevil. Highest larval population encountered in 
any field -was found on Jul/ 3* In this field. 25O larva.e i-jore collected 
per' 100 net sweeps. In nost fields the nunber collected was" less than 
100 , 
