Title: Effect of the vegetable leafminer, Liriomyza sativae Blanchard, and the associated plant pathogens on yield and quality of the tomato, Lycopersicon esculentum Mill. cv. Walter
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00098437/00001
 Material Information
Title: Effect of the vegetable leafminer, Liriomyza sativae Blanchard, and the associated plant pathogens on yield and quality of the tomato, Lycopersicon esculentum Mill. cv. Walter
Alternate Title: Liriomyza sativae
Lycopersicon esculentum
Physical Description: x, 154 leaves : graphs ; 28 cm.
Language: English
Creator: Keularts, Jozef Leo Willem, 1945- ( Dissertant )
Waddill, Van H. ( Thesis advisor )
Strayer, John R. ( Reviewer )
McMillan, Robert T. ( Reviewer )
Pohronezny, Kenneth L. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1980
Copyright Date: 1980
Subjects / Keywords: Entomology and Nematology thesis Ph. D
Tomatoes -- Diseases and pests -- Control   ( lcsh )
Leafminers -- Control   ( lcsh )
Dissertations, Academic -- Entomology and Nematology -- UF
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
Abstract: In the period from 1977 to 1980 a number of field experiments were carried out at the University of Florida Agricultural Research and Education Center in Homestead to determine the effect of various levels of discrete or repeated, mechanical defoliation of 'Walter 1 tomato plants on components of marketable yield. Treatments consisted of 100% defoliation and separate 20%, 40%, 60%, and 80% defoliations of the lower or the upper part of the plants. A differential sensitivity to defoliation in the course of the plants' development was observed. The most sensitive times appeared to be early in the season and at mid-season. In most cases, however, at least 60% of the foliage had to be removed before total marketable fruit yields and yields in the largest, most profitable size categories were significantly reduced when compared to yields from the control plants. Tomato plants exhibited less tolerance of repeated defoliation with removal of 40% of the total leaf area often resulting in yield loss in the first harvest. However, the total yield of the first two harvests combined was not significantly reduced when compared to yields from nondefoliated plants. The total marketable yield of the tomato plants at any level of defoliation was significantly correlated with the gross revenue a grower would obtain from the harvested fruit based on different prices for the various size categories. Major defoliation associated with leafminer damage in commercial production plantings is the result of the adverse effect of pathogens inhabiting the leaf mines. In this study the pathogen most commonly associated with the leaf mines has been identified as Alternaria alternata (Fries) Keissler. It appears to be only weakly parasitic, its detrimental effect depending on the nutrient supply provided in the mine by mesophyll cells lacerated by the leafminer larvae. Additional damage to the leaf can also be done by other pathogens such as J<anthomonas vesicatoria (Doidge) Dows., which may enter mines when bacterial spot disease pressure is high. The actual damage to the tomato leaf by the leafminer larvae themselves seems to be restricted to the removal of photosynthetically active tissue. The main concern for growers, therefore, should lie in the occurrence of infection of the mines. Infection is probably less likely to occur when the nutrient supply available for the pathogen is too little for it to do harm to the leaf tissue. This is the case when the larvae are killed early in their development so that only a small amount, of leaf tissue has been consumed. The most effective way for ensuring their early death and, consequently, low leafminer populations is effective use of the numerous parasites of the fly. This can best be achieved by applying sound pest management practices. If there are too few parasites to control the leafminer population effectively then insecticide applications specifically to control the leafminer are necessary. If the defoliation level in prebloom plants reaches 30% or in postbloom plants reaches 50%, then insecticide treatments are recommended.
Statement of Responsibility: by Jozef Leo Willem Keularts.
Thesis: Thesis--University of Florida.
Bibliography: Bibliography: leaves 143-153.
General Note: Typescript.
General Note: Vita.
 Record Information
Bibliographic ID: UF00098437
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000014425
oclc - 06800011
notis - AAB7649


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