. Annals of applied biology. Biology, Economic; Biochemistry. 2 Control of the Greenhonm White Fly autumn owe their origin mainly to the adults which are continually passing out of the greenhouses and, to a less extent, to those which have been fostered in cold frames over the winter. At the same time it is highly probable that the insect can survive mild winters out of doors in the south of England and it can certainly do so in the Channel Islands where it is a more serious pest than in the Lea Valley. In the winter of 1919-20, when the insect was being bred for the purposes of this study, th
. Annals of applied biology. Biology, Economic; Biochemistry. 2 Control of the Greenhonm White Fly autumn owe their origin mainly to the adults which are continually passing out of the greenhouses and, to a less extent, to those which have been fostered in cold frames over the winter. At the same time it is highly probable that the insect can survive mild winters out of doors in the south of England and it can certainly do so in the Channel Islands where it is a more serious pest than in the Lea Valley. In the winter of 1919-20, when the insect was being bred for the purposes of this study, the adults could be found around the experimental house throughout, especially on Althaea rosea and Aquilegia. The first emergence of the. Fie;. 1. Adult A. vaporariorvw ( x 100). adults of the insects breeding outside was observed on July 1. Through the summer and autumn they were excessively numerous in the garden and became a serious pest on runner beans. At the beginning of December the greenhouses and cold frames were free from the pest but the adults were still to be found on Digitalis and Althaea where a batch of recently laid eggs was seen. Unfortunately the leaf which held these perished. In early December there was a week of snow with 23 degrees of frost on one occasion. Two adults were seen alive after this. The latter half of the month was cold and wet and no more of the insects were found in. 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. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbiochem, bookyear1922
