Identifier: journalofagricul06unit (
find matches)Title:
Journal of agricultural researchYear:
1913 (
1910s)Authors:
United States. Dept. of Agriculture Association of American Agricultural Colleges and Experiment Stations Association of Land-Grant Colleges and Universities Association of Land-Grant CollegesSubjects:
Agriculture -- United StatesPublisher:
Washington, U.S. Govt. Printing OfficeContributing Library:
The LuEsther T Mertz Library, the New York Botanical GardenDigitizing Sponsor:
The LuEsther T Mertz Library, the New York Botanical GardenView Book Page:
Book ViewerAbout This Book:
Catalog EntryView All Images:
All Images From Book Click here to
view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:Journal of Agricultural Research Vol. VI, No.2 PLATE VIOviposition of Megasiigmus spermotrophus in the cones of Douglas jfir: Fig. I, 2.—Two positions of female on surface of cone with ovipositor inserted.Photographed from dead females which had been killed in this position. Enlarged. Fig. 3.—Female resting on cone with ovipositor inserted. Photographed from life.Enlarged. PLATE VIIOviposition of Megastigrmis spermotropkus in the cones of Douglas fir: Fig. I.—Female in act of withdrawing ovipositor from cone. Photographed fromlife. Enlarged. Fig. 2.—Section through a Douglas fir cone on which a female has been killedwhile in the act of ovipositing. Fig. 3.—A portion of same cone and dead female with ovipositor inserted. Slightlyretouched to show course followed by ovipositor in reaching the seed. Oviposition of Megastigmus spermotrophus Plate VIIText Appearing After Image:Journal of Agricultural Research Vol. VI, No. 2 CITRUS CANKERS By Frederick A. Wolf,^Plant Pathologist, Alabama Agricultural Experiment Station INTRODUCTION The ravages of certain insect pests and plant maladies have, in a con-siderable number of instances, been so severe as to cause intense alarm.It has been feared in the case of several crops that their culture was nolonger possible in certain sections because effective means of preventingthe losses resulting from such ravages were not then known. Within thelast two years it has been realized that a new disease known as Citruscanker has been introduced into the Citrus-growing sections of the GulfCoast States. This disease, beyond all doubt, is the most destructivemalady affecting species of Citrus, and when it was realized that its con-trol and eradication were so difficult, alarm concerning the future pro-duction of Citrus fruits became almost an hysteria. Those who havenever seen Citrus canker under field conditions regard the repNote About Images 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 work.