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Foliar stage of gumming disease present in sugarcane plantations in Mexico

Hilda Victoria Silva-Rojas: Colegio de Postgraduados

<div><span lang="en-US">n 2012, gumming diseases caused by </span><span lang="en-US"><i>Xanthomonas vasicola</i></span><span lang="en-US"> pv. vasculorum was identified</span><span lang="en-US"><i> </i></span><span lang="en-US">in sugarcane plantations in Mexico. </span><span lang="en-US"> </span><span lang="en-US">Only foliar phase was present causing the distinctive symptoms such as yellow stripes and reddish dots. The diseases caused an approximately 5 t ha</span><span size="-1"><span lang="en-US"><sup>-1</sup></span></span><span lang="en-US"> yield reduction in stalk sugar content. During 2013-2014 a study was performed to determinate the presence of gumming systemic phase in sugar cane cultivated in the pacific and central regions of Mexico. For this goal, stalks with symptomatic leaves were collected and bacterial isolates were recovered from nutrient agar medium. Isolates were identified by PCR and sequencing of 16S rDNA gene. The diseases was present only at the leaves. No systemic stage of the disease was observed in stalk samples. In Mexico, the disease was detected in the region between the coordinates</span><span lang="en-US"><b> </b></span><span lang="en-US">18° 50´ 59” N and 98° 57´ 46” W to 18° 05´21” and 93°21´23 W with temperature and relative humidity conditions of 23.5 to 25°C respectively and 70% RH. Thus, it is concluded that the systemic phase of the disease does not develop under this environmental conditions. </span></div>