































































Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
seminar on Phytopathological Classics: Classical work of Adolf Mayer, Dmitrii Ivanowski, Martinus Beijerinck and Erwin Baur on Plant Virology
Typology: Slides
1 / 71
This page cannot be seen from the preview
Don't miss anything!
DEPARTMENT OF PLANT PATHOLOGY COLLEGE OF AGRICULTURE, VNMKV, PARBHANI 431 402 (M.S.)
Phytopathological classics Reprints of outstanding research papers published in non English journals Have been translated in English Published by American Phytopathological Society 15 in Number Not available in most of the Libraries of the world
Phytopathological Classics: Classical work of Adolf Mayer, Dmitrii Ivanowski, Martinus Beijerinck and Erwin Baur on Plant Virology Earliest Record of Plant Virus Yellow Vein Net Disease of Eupatorium was described in a Japanese poem, written in the eighth century (Saunders et al., 2003)
Adolf Mayer
Concerning mosaic disease of tobacco Adolf Mayer 1886 entitled "Ueber die Mosaikkrankheit des Tabaks," (first published in Dutch in 1885) Netherlands Tobacco disease prevailing form many years Disease not subject of investigation as yet, Scientific treatment of technical questions Had not yet taken a firm root in Holland
Concerning mosaic disease of tobacco Manifestations of this disease: Mosaic-like coloring 3 - 5 weeks after transplanting. Thickness in darker colored spots. Thicker places growing more vigorously Results in manifold & irregular distortions Finally, lighter & thinner parts died prematurely Spotting appeared in fully ripe leaves not detrimental to value of product.
Concerning mosaic disease of tobacco Disadvantages of disease: Retardation of growth Decreased in yield. Curling of leaves Useless for manufacture of cigars Brittleness of leaves. Insufficient ripening Poor burn Harmful to aroma
Concerning mosaic disease of tobacco Regional names to disease: Rhenen & Amerongen: bunt (bont) first stage of spotting Southern Germany: rust (roest) later stage of yellow colored spots Popular name with grower: Smut Mayer: None of these expressions seemed very desirable for general usage In order to prevent confusion he suggested an international name “mosaic disease of tobacco” First time used term “mosaic” to give a fair picture at least of first apparent stage of disease. To find out cause of disease took opinions of farmers & found specific favorite theories
Concerning mosaic disease of tobacco Comparative analyses of tobacco soils from Rhenen Reaction Tobacco diseased Only little diseased 1 2 3 4 Weak % Acid % Weak % Acid % Loss of ignition 2.9 7.3 3.0 5. Silicic acid 0.15 0.13 0.17 0. Aluminum & iron 1.34 1.11 1.55 0. Lime 0.14 0.08 0.21 0. Magnesium 0.09 0.01 0.11 0. Potassium 0.14 0.07 0.11 0. Sodium 0.05 0.22 0.05 0. Sulphuric acid 0.02 0.02 0.02 0. Phosphoric acid 0.23 o. 12 0.25 o. 10 Chlorine 0.03 0.01 0.02 ----
Concerning mosaic disease of tobacco
No. 3 No. 4 per cent per cent Decantable part 19.0 not determined, but very similar to No. 3 Loss on ignition 4. Water-holding capacity in per cent. vol. 36. Apparent weight 1.31 1. Content of alkali-soluble organic matter 2.6 2. Content of phosphoric acid 0.37 0. Content of phosphoric acid in alkali- soluble organic matter
Concerning mosaic disease of tobacco As a result of communications from Herr Versteegh in Amerongen his attention was directed to growth conditions in hot beds (small houses) Plant developed entirely normally None of modifications employed in regulation of hot beds had caused mosaic disease Other experiment in which planting was purposely so done that roots of young plants were variously bent or injured, as happen in careless transplanting Proved fairly harmless Not influence on production of disease
Concerning mosaic disease of tobacco Sudden transition in temperature & transpiration experiment o Answered in negative o Proved detrimental to growth of plants o But disease was not caused by this o Plants standing too close together in hot bed later acquired disease was also investigated & disproved. Ryks landbouw school foreign tobacco varieties were planted All foreign varieties of tobacco were entirely free from disease