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effect. Table 3. Effect of two loci on bacterial spot race T4 foliar disease severity in tomato across four populations and two seasons. Resistance to fusarium wilt race 3 was associated with greater susceptibility to bacterial spot in all populations

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Phytopathology 97 461 469 Zhou, X.G. Everts, K.L. Bruton, B.D. 2010 Race 3, a new and highly virulent race of Fusarium oxysporum f. sp. niveum causing fusarium wilt in watermelon Plant Dis. 94 92 98 Zink, F.W. Thomas, C.E. 1990 Genetics of resistance to

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likely to exist. Table 2. Genetic analysis of Solanum lycopersicum × Solanum pennellii BC 1 F 1 populations for identifying potential sources of novel resistance to fusarium wilt race 3. Segregation for Fol3 resistance was observed for

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selections underwent separate greenhouse evaluations for Fusarium wilt ( F. oxysporum f. sp. lycopersici race 2), gray leaf spot ( S. lycopersici ), and bacterial spot ( X. perforans race T3). Greenhouse trials were conducted using a randomized complete

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grafted plants could be more evident as watermelon fruit develop. Table 3. Root characteristics of nongrafted and grafted seedless watermelon ‘Melody’ in 2015 and 2016 greenhouse experiments with Fusarium oxysporum f. sp. niveum race 2 inoculation. The

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-knot nematode (RKN) race 3. In greenhouse tests, the resistance is greater than resistant ‘Jewel’ and highly susceptible clones ‘Beauregard’ and ‘Porto Rico’. In tests from 2003, 2004, and 2005, average ratings for RKN egg masses for ‘Covington’ were 0.7 (‘Jewel

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Forty-two Lycopersicon pennellii Corr. D'Arcy accessions, from the Tomato Genetics Stock Center, were inoculated for resistance to Fusarium wilt race 3 at the 3-leaf and cotyledon stage. All were over 90% healthy when inoculated at the 3-leaf stage but had greater disease incidence at the cotyledon stage. Crosses were made between healthy plants within each accession. Using this seed, 39 accessions were 100% healthy and 3 were over 96% healthy when inoculated at either stage. Seventeen F1's with susceptible parents were tested for race 3 and all had over 80% healthy plants. Twenty-two accessions were tested for Fusarium wilt race 1 and race 2. For race 1, 21 were 100% healthy and 1 was 91% healthy, For race 2, 20 were 100% healthy, 1 was 96% healthy, and 1 was 75% healthy. Forty accessions were screened for Fusarium crown rot and Verticillium wilt. For crown rot, LA 1277, LA 1367, and LA 1657 were over 95% healthy, 6 other accessions were over 68% healthy and several others had over 50% healthy plants, All 40 were susceptible to Verticillium wilt race 1. L. pennellii appears to be a good source of resistance to Fusarium sp. but not to Verticillium wilt.

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Abstract

Bacterial wilt (Pseudomonas solanacearum E.F. Smith biovar III) causes substantial losses in susceptible tomato (Lycopersicon esculentum Mill.) cultivars in coastal Queensland from late spring to autumn (3). Verticillium wilt (Verticillium dahliae Kleb. race 1) can be a major disease from autumn to early spring. A previously released cultivar, Scorpio (3), is resistant to bacterial wilt and Fusarium wilt (Fusarium oxysporum Schlecht, ex Fr.f.sp. lycopersici (Sacc.) Snyd. and Hans, race 1), but lacks resistance to Verticillium wilt. Fruit of this cultivar are relatively soft. ‘Redlands Summertaste’ a hybrid, was developed to provide a locally adapted tomato cultivar in which resistances to bacterial, Verticillium and Fusarium wilts are combined with good fruit quality.

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Abstract

Susceptible tomato (Lycopersicon esculentum Mill.) cultivars in coastal Queensland may suffer substantial losses from bacterial wilt [Pseudomonas solanacearum (Smith 1896) Smith 1914 biovar III] from late spring to autumn (3). Verticillium wilt (Verticillium dahliae Kleb. race 1) can be a major disease from autumn to early spring. A hybrid cultivar, Redlands Summertaste (1), recently was released and is resistant to bacterial wilt, verticillium wilt, and fusarium wilt [Fusarium oxysporum Schlecht, f.sp. lycopersici (Sacc.) Snyder & Hansen race 1 and 2]. However, although this cultivar has high yields (75 to 92 t·ha–1), the jointed fruit attachment and indeterminate growth habit limit returns to growers who have high labor costs. ‘Redlander’ was developed as an inbred cultivar to provide a locally adapted tomato in which resistances to bacterial, verticillium, and fusarium wilts are combined with good fruit quality, jointless pedicel, and determinate growth habit.

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Abstract

The mode of inheritance of resistance to Fusarium wilt (Fusarium oxysporum f. sp. melonis) races 0 and 2 in muskmelon (Cucumis melo L.) cv Perlita FR and race 2 in ‘Doublon’ was determined by analyzing segregation of F1, F2, F3, and BC1 populations of crosses with susceptible ‘PMR 45’. The ratios obtained indicate that resistance to both races 0 and 2 in ‘Perlita FR’ is conferred by a dominant gene. The segregation data indicate that resistance to race 2 in ‘Doublon’ also is conferred by a dominant gene. Allelism tests indicated that gene Fom-1, which controls resistance to race 0 in ‘Doublon’, is different from the gene controlling resistance to race 0 in ‘Perlita FR’ and that 2 different genes confer resistance to race 2 in ‘Doublon’ and ‘Perlita FR’. The reaction of ‘Perlita FR’ and ‘Doublon’ backcross progenies of (resistant × susceptible) × susceptible, inoculated simultaneously or sequentially with race 0 and race 2, suggest that gene Fom-1 confers resistance to races 0 and 2 in ‘Doublon’ and that a single gene confers resistance to both races 0 and 2 in ‘Perlita FR’. The resistant dominant gene in ‘Perlita FR’ is designated F. oxysporum f. sp. melonis 3 (Fom-3). The source of Fusarium wilt resistance in ‘Perlita FR’ is discussed. ‘Perlita FR’ was found susceptible to race 1 and race 1, 2.

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