. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Ill 111 MINN Hi . M I'M: IMKX'l HI ill I'BK I ll-lll \ \ I l!N Mh l(..h«rr HA1, n-( I(V \t m\> Tiphia vemalis is a Chosen species which baa for its normal host Popwia castanoptera. It iras found by the junior miter in V I'.il'l'. In estabuahing the value of this and nil other Chosen Bcoliicfs, they were first tested out on Larvae "f P. japonica which were taken from Japan t Chosen for thai purpose, if they readily accepted the Japanese Popillia, they were considered of economic importance and their Btudy


. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Ill 111 MINN Hi . M I'M: IMKX'l HI ill I'BK I ll-lll \ \ I l!N Mh l(..h«rr HA1, n-( I(V \t m\> Tiphia vemalis is a Chosen species which baa for its normal host Popwia castanoptera. It iras found by the junior miter in V I'.il'l'. In estabuahing the value of this and nil other Chosen Bcoliicfs, they were first tested out on Larvae "f P. japonica which were taken from Japan t Chosen for thai purpose, if they readily accepted the Japanese Popillia, they were considered of economic importance and their Btudy and rearing were continued. In the Btudiee of Beveral Bpecies of Tiphia it was f'-und that the group a> a whole tends to he limited to a bost geUUS lather than to | single species. 'l"iph'<ut a- a rule this bost i» physiologically unlit, being Dear the pupal period to he readily parasitized. On the other hand. P japonica is taken early enough t<. he suitable. In captivity this Tiphia has been reared on four Bpecies <»f Popillia. In the spring of 1922 a few indi- viduals were reared on /'. japonica fi<:. 28). hut in 1923 tin- work was undertaken on a large scale with native hosts. Hundred- of females Were collected in the field and brought to the laboratory for ovi- position and rearing of larva-. The same rearing methods were used as for the preceding Bpecies. At times as many as 450 females were on hand for this purpose. From a total .„ , of 5,785eggs obtained at Suigenin -Larva of Popillia japonica parasitized , nno n r,-AT _ . . by Tiphiaremaiit 1923. 2,3o0 cocoons were Fig. 28. LIFE HISTORY AND HABITS The adults of Tiphia oernalis are found in the field from May 5 to June 14. with a maximum abundance from May 10 to 25. Feeding takes place largely upon honeydew produced by aphides on pine, oak, and chestnut. The females are most abundant on chestnut foliage from to a. m. on warm, bright mornings. A low temperature tends mar


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