Relazione dell'Entomologo di Stato sugli insetti nocivi e benefici dello stato dell'Illinois . o e Bacillus subtilis. I batteri degli insetti si svilupposolo nel tubo infetto contenente l'infusione di manzo. In questi tubiemiriadi di questi batteri si sono verificati, sia in masse zoogloee che in individui asseparati, ma non è comparso nessun altro microrganismo. InOne dei campi che erano stati attaccati più peggio da cinch-insetti, theleaves erano morti come le orecchie. Qui si è notato che il thesheath della foglia è stato spesso gommato al gambo da una spessa exu-dation, come colla semi-essiccata. Qualche adu morto

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Report of the State Entomologist on the noxious and beneficial insects of the state of Illinois . o and Bacillus subtilis. The bacteria from the insects developedonly in the infected tube containing the beef infusion. In this tubemyriads of these bacteria occurred, both in zoogloea masses and asseparate individuals, but no other micro-organisms appeared. Inone of the fields which had been worst attacked by chinch-bugs, theleaves were dead as high as the ears. Here it was noticed that thesheath of the leaf was often gummed to the stalk by a thick exu-dation, like half-dried glue. A few dead adults were noticed here, imbedded in mold, but of a different kind from that seen at Jack-sonville. When portions of this exudation were moistened andstudied under the microscope, the fluid was found thick with bac-teria, indistinguishable from those occurring in the bodies of theinsects, and the same were thickly scattered through the translucentmasses of viscid jelly. The inference was plain that they were de-rived from the excrement of the chinch-bug, in which they hadcontinued to develop. 52. Fig. 7. The chinch-bug bacterium {Micrococcus insectorum, Burrill). From artificial cultivation in beef broth. Magnified 1000 di-ameters. - On the 2cth of September, several stained and mounted slides ofthis material and of the contents of the various culture tubes, weresubmitted to Prof. Burrill, of Champaign. The slides were carefullystudied by him, and to him I owe the determinations of the variousforms observed. The insect bacterium was described by him underthe name of Micrococcus insectorum, in the Eleventh Keport of theIllinois Industrial University, in the following terms: Cells obtusely oval, isolated or in pairs, rarely in chains of severalarticles; .000022 in. wide, and .000027 to .00004 in. long, usuallyabout .000032 long; movements oscillatory only; forming zoogloea (?).In the digestive organs of chinch-bugs (Blissus leucoptcrns). * * *The organism is somewhat similar to, but

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubjectbenefic
• bookyear1876