. Journal of Agricultural Research. 08 200 9. 00 2. 00 100 4. 00 . 00 100 2. 00 55-00 42. 00 . 00 o. 00 92. 16 40 Journal of A gricultural Research Vol. XXV, No. 1 Table III.—Mortality of Platygaster vernalis, as observed in collections of Hessian flyforms made at intervals during the years igi8, IQIQ, 1920, and igzi—Continued 1921: EIGHT COLLECTIONS FROM FARM, NEW WINDSOR, MD.—Continued. Date o( collection. May 9June 3 21July 12 28Aug. 12 30Sept. 23 Results of examination of Hessian fly forms. Fly forms I examined. Contain-ing livingP. vernalis. Number
. Journal of Agricultural Research. 08 200 9. 00 2. 00 100 4. 00 . 00 100 2. 00 55-00 42. 00 . 00 o. 00 92. 16 40 Journal of A gricultural Research Vol. XXV, No. 1 Table III.—Mortality of Platygaster vernalis, as observed in collections of Hessian flyforms made at intervals during the years igi8, IQIQ, 1920, and igzi—Continued 1921: EIGHT COLLECTIONS FROM FARM, NEW WINDSOR, MD.—Continued. Date o( collection. May 9June 3 21July 12 28Aug. 12 30Sept. 23 Results of examination of Hessian fly forms. Fly forms I examined. Contain-ing livingP. vernalis. Number. 117100100100100no100100 Per 0016. 0016. 00 20. 91 21. 00 6. 00 Contain-ing deadunrecog-nizablematterand deadP. vernalis. Per cent. 15-3921. 0023. 00 Otherwiseparasitized. Per 0040. 00 28. 18 29. 0021. 00 Living un-parasitizedfly forms. Per 00 4- Mortality ofP. vernalis. Per 0017. II. ?^- 4.—Mortality of Platygaster vernalis, as observed in collections of Hessian fly fonns made at Carlisle, Pa., in 1918. (Tabic III.) In all cases, for the sake of the uniformity necessary in obtainingcorrect percentage results, the host is taken as the unit. For instance,if all the individual parasites in a single host were dead, the latter wasclassihed as containing dead vernalis, but if one or more of the vernaliswere alive, the host was classified as containing the living parasite. Under the heading Otherwise parasitized are included pupariafrom which parasites other than vernalis have emerged, or in which suchother parasites are recognized whether dead or alive. In case of the re-cognizable occurrence of both vernalis and some other parasite in the July 7, 1923 Platygaster vernalis, Hessian Fly Parasite 41 same host, it was classified according to the condition of verymlis. Suchcases were comparatively few. The number of hosts containing dea
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