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(2013), studying the effect of different nitrogen dosages in formulation with the potassium (NPK 20-00-20) applied in topdressing in the severity of the gummy stem blight (Didymella bryoniae) in watermelon, verified that the fertilization with these nutrients did not affect the severity of the disease.
Reaction of melon genotypes to the gummy stem blight and the downy mildew.
Gummy stem blight: Caused by Didymella bryoniae, a fungus that can infect most members of the cucurbit family.
The G64.680 marker, also a component of a partial linkage group comprised of three TRAPs, detected a QTL conferring resistance to ashy stem blight in the field (14%).
TRAP markers in the Dorado/XAN 176 RIL population associated with QTL conditioning resistance to common bacterial blight (CBB), Bean golden yellow mosaic virus (BGYMV), and ashy stem blight (ASB).
PI 82264 (Walters and Caviness, 1973) and PI 181550 (Athow, 1987) have resistance to Phomopsis seed infection, while 'Delmar' (Crittenden and Cole, 1967) has resistance to pod and stem blight caused by Phomopsis sojae Lehman, [teleomoph; D.
In addition, the severity of pod and stem blight on PI 80837 was less than that of MO/PSD-0259, PI 91113, and AP 350 in field and greenhouse tests (Jackson, 2000).
Gummy stem blight was first described by Fautrey and Roumeguere in France as the disease caused on cucumber (Cucumis sativus L.) by Ascochyta cucumis in 1891 (Chiu and Walker, 1949; Sherf and MacNab, 1986).
Gummy stem blight on watermelon plants is evident as crown blight, stem cankers, and extensive defoliation, with symptoms observed on the cotyledons, hypocotyls, leaves, and fruit (Maynard and Hopkins, 1999).
Adequate control of gummy stem blight through fungicide applications (Keinath, 1995, 2000) and good cultural practices (Keinath, 1996; Rankin, 1954) is difficult, particularly during periods of frequent rainfall when relative humidity remains high for a long period.
vulgaris/P, coccineus//233B) by single-plant selection in the greenhouse for resistance to Xcp strain 484a (three generations) and intermittent selection among progeny rows in the field for moderate maturity, good yield potential, and resistance to rust and ashy stem blight. The original P.
Some researchers (Beebe and Pastor-Corrales, 1991; Pastor-Corrales and Abawi, 1988) allude to, or report, strong correlations between field and greenhouse reactions to ashy stem blight, whereas, Miklas et al.
A recombinant inbred population of 119 randomly derived [F.sub.5:7] lines (RILs) generated from a Dorado (formerly DOR 364) X XAN 176 hybridization was evaluated for field reaction to ashy stem blight at the University of Puerto Rico, Fortuna Substation at Juana Diaz, PR, (fine-loamy, mixed, isohyperthermic Cumulic Haplustoll) during the summers of 1993 and 1994.
Some plants may have succumbed to root rots or stem blights. For whatever reason, spaces exist.
Crop rotation is not an effective control of leaf and stem blights where spread can occur through wind and water splashed spores.