Estimating the Nema Population of Soil, with Special Reference to the Sugar-beet and Root-gall Nemas, Heterodera Schachtii Schmidt and Heterodera Radicicola (Greef) Müller: And with a Description of Tylencholaimus Aequalis N. SpOn the basis of new anatomical investigations, new and more accurate comparisons are made between the larvae and the males of the two species of Heterodera, the two nemas that most seriously damage sugar beets. |
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acid alcohol aliquot amphids anal anus Aphelenchus apparatus Archionchus beets blade bottom bulb bursa caudal census method cent cl nrv Compare with figure conical pile cover glass crop cuticle cylinder cylindroid decant diameter diaphragm dish Dorylaimus eggs examination eyepiece field Glacial acetic acid glycerine grn int head heterocephalus Heterodera schachtii illus inch infested intestinal Jum oe labial larvæ larvæ of H less lip region liquid male material meshes mixture nerve cell nucleus number of nemas object œsophagus oöcyt Oppl oral spear papilla pharyngeal plants posterior swelling puddled removed roil roots sal dsl sal subm salivary gland sample of soil sector sieve sifting soil samples soil-census soil-sampling tubes soldered solution species spiculum spider spider web spinneret square aperture striæ striated subdivided submedian surface tion Tylencholaimus aequalis Tylenchus Tylopharynx type specimens vessel vulva washing watch glass