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Effects of Time of Symptom Expression of the Leaf‐Crumple Virus on Yield and Quality of Fiber of Cotton 1
Author(s) -
Schaik P. H.,
Erwin D. C.,
Garber M. J.
Publication year - 1962
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1962.0011183x000200040002x
Subject(s) - crop , yield (engineering) , library science , horticulture , biology , operations research , mathematics , computer science , agronomy , physics , thermodynamics
HE Leaf-crumple disease occurring in cotton-growing T areas of southern California and Arizona was first described in 1954 ( 2 ) . The incidence of the disease became more severe with increasing popularity of perennial (stub or rattoon) cotton between 1954 and 1959. Growing trends to mechanization, particularly in harvesting, and greater insect problems have reduced the popularity of stub cotton and thereby the incidence of the Leaf-crumple Virus disease in 1960 and 1961. Laird and Dickson ( 5 ) showed that the virus was transmitted by the sweetpotato white fly (Bemisia tabaci (Genn.) ) . Additional information on resistance and susceptibility of certain varieties and species of Gossypiunz, and the existence of a mild and a severe strain of the virus were reported (3, 4) in 1961. Allen ct al. (I), measured the effect of the virus on yield of individual plants within a variety test block at Yuma, Arizona, and showed that plants with symptoms yielded 20.6% less than healthy ones in first year cotton and 16.8% less in stub cotton. Normally occurring variability between plants was not taken into account. They showed an increase in incidence of disease with advance of the growing season but did not measure yield losses on individual plants infected at different times. Since field evaluation of the effect of an insect-transmitted virus disease is difficult because of the natural spread into disease-free control plots, the effect of the virus was evaluated by recording the incidence of disease in the field at intervals throughout the growing season. Yield and quality, determinations were then correlated with time of symptom expression. The results of a three-year study are reported here.