خيارات البحث
النتائج 1 - 9 من 9
Selecting stone fruit trees free from virus diseases
1952
Milbrath, John A.
Fighting the blueberry fruit fly in Maine
1952
Lathrop, Frank H. (Frank Heidtman)
Oriental fruitfly parasites: Biological control of damaging pest established in Hawaii diminishes threat to mainland's fruit production النص الكامل
1952
R Bosch
The oriental fruitfly threat to California's fruit industry has been reduced by the successful establishment in Hawaii of natural enemies of the pest.
اظهر المزيد [+] اقل [-]1950 summary of results of fungicide tests on fruit and nut trees النص الكامل
1952
1950 summary of results of fungicide tests on fruit and nut trees النص الكامل
1952
Investigations on the phytotoxicity of Bordeaux mixture to tomatoes النص الكامل
1952
Aberdeen, J.E.C.
Bordeaux mixture (4-4-40) was shown in a series of experiments to have a higher toxicity for the tomato plant than Bordeaux 4-2-40 and various "inert" copper compounds. Experimental results indicated that the lime content of Bordeaux mixture is an important factor in phytotoxicity to tomatoes. The evidence obtained suggests that Bordeaux mixture adversely affects transpiration, photosynthesis and translocation, and through the general physiological upset impairs flower setting. A new method of estimating phytotoxicity was devised and is described in detail.
اظهر المزيد [+] اقل [-]Field crop insects
1952
Fenton, F. A.
This book addresses insect abundance and distribution, the nature and use of insecticides, control by physical, mechanical, cultural, and biological means, plant quarantine and pest control campaigns, and leaf-destroying, sap-sucking, fruit-feeding, soil-inhabiting, and boring insects and those that feed on floral parts, seeds, and farinaceous material. The book is designed for use in a beginning course for agricultural students.
اظهر المزيد [+] اقل [-]Controlling mildews in fruits
1952
Helton, A. W.
Schädliche Tiere und Pilze an den Obstgehölzen und ihre Bekämpfung | Injurious animals and fungi in fruit and their control
1952
Mehlisch, K.
