. Annals of applied biology. Biology, Economic; Biochemistry. 126 Biolofpj arul Kronomic Significance ry/'Tipiila paludosa The experience here recorded has been general for a series of years; large numbers of Tipiila larvae have been regularly obtained from lea fields upon farms on Deeside and elsewhere in the neighbour- hood, which during the periods tested had no crop losses due to their attacks. In a good many such cases the numbers obtained from single fields were considerable. A case where serious damage was effected is given upon page ? Fig. 3. Plan of Craibstone Home Farm. Experim
. Annals of applied biology. Biology, Economic; Biochemistry. 126 Biolofpj arul Kronomic Significance ry/'Tipiila paludosa The experience here recorded has been general for a series of years; large numbers of Tipiila larvae have been regularly obtained from lea fields upon farms on Deeside and elsewhere in the neighbour- hood, which during the periods tested had no crop losses due to their attacks. In a good many such cases the numbers obtained from single fields were considerable. A case where serious damage was effected is given upon page ? Fig. 3. Plan of Craibstone Home Farm. Experimental Field, No. 5. Summarising the outstanding features of this record we note: (1) An apparent scarcity of larvae in spring before ploughing took place. The failure to find Tipula was not as subsequent finds proved due to their smallness of size, and it does not seem likely that they were deeply situated in the soil at this time. They have rarely been found below six or eight inches under the surface. Tests made wath deep cages in winter (Feb. and March) yielded only insignificant numbers (eight per cent.) below six inches from the surface. (2) When known to be present in the field they could not be found in the act of attacking the crop. The suggestion that they feed at night is plausible, but observations on larvae in cages have shown that they feed readily at all times. The fact that there was an abundance of humic matter in the soil is probably not without significance in this connection (see pp. 127—8).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Association of Applied Biologists; Association of Economic Biologists. [Wellesbourne, Warwick, etc. ] Association of Applied Biologists [etc. ]
Size: 1998px × 1250px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcol, bookdecade1910, booksubjectbiochemistry
