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STUDIES ON POTATO VIRUS DISEASES V. INSECT TRANSMISSION OF POTATO LEAF‐ROLL
Author(s) -
SMITH KENNETH M.
Publication year - 1929
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1929.tb07131.x
Subject(s) - biology , myzus persicae , aphis , aphid , virus , aphis gossypii , inoculation , potato virus y , horticulture , transmission (telecommunications) , plant virus , botany , agronomy , pest analysis , aphididae , virology , homoptera , electrical engineering , engineering
SUMMARY.1 Inoculation experiments with seven different species of insects carried out in 1927 gave negative results, except in the case of the aphis Myzus persicae Subs, which gave a high percentage of positive infections. 2 Further inoculation tests with this aphis in 1928 proved it to De an efficient carrier of the leaf‐roll virus. 3 Experiments carried out during two years on the question of the inheritance of the leaf‐roll virus by the progeny of Effective aphides proved negative. It is therefore assumed that the virus is not hereditary in the offspring of the aphis. 4 One or two virus‐bearing aphides are capable of infecthg a healthy potato plant with leaf‐roll. Such infection when achieved differenced in no degree of severity from that induced by 18 aphides. The incidence. of infection was greatest among plants colonised with groups of 18 infective aphides. 5 Colonisation of virus‐bearing aphides upon non‐solanaceous hosts such as cabbage for periods varying from 24 hours to 7 days did not affect the subsequent infective power of such aphides. 5 M. persicae , when colonised upon plants affected with combinations of viruses of which leaf‐roll was one constituent, transmitted only leaf‐roll to healthy potatoes. The combinations used were leaf‐roll and streak, and leaf‐roll and mosaic. In the latter case the aphis was shown, by its infection of tobacco with a mottling disease, to be picking up both viruses of which only leaf‐roll developed in the potato. 7 The incubation period of the leaf‐roll virus' in the plant averaged about 30 days under glasshouse conditions. In some cases the disease was found to develop in 18–20 days. 8 Seven varieties of potato have been infected with leaf‐roll by means of M. persicae. There existed no apparent difference in degree of resistance to leaf‐roll. 9 The leaf‐roll virus can be disseminated by the feeding of M. persicae , either on the sprouts of the tuber, on the leaves and shoots of the growing plant, or on the stem alone.