Resistance of different tomato varieties (Lycopersicon esculentum) to late blight (Phytophthora infestans) in laboratory conditions at UAC Carmen Pampa, in the province of Nor Yungas, department of La Paz

• Main Author: Florez Paxi, Andrez Faustino
• Format: Others
• Published: BYU ScholarsArchive 2008
• Subjects: Tomatoes; disease and pest resistance; Bolivia; Agronomy and Crop Sciences; Life Sciences
• Online Access: https://scholarsarchive.byu.edu/etd/5365; https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=6364&context=etd

In order to respond to the low economic and harvesting yields caused by diseases that attack the tomato, we considered using tomato varieties resistant to late blight (Phytophthora infestans) of tomato (Lycopersicon esculentum) and potato (Solanum tuberosum). The evaluation of the percentage of infestation was performed with tomato leaflets over a 168 hour period. The percentage of infestation was recorded every eight hours from the time of inoculation until maximum infestation was reached. The methodology applied was at random and included six treatments and five replications. The experiment consisted of collecting healthy leaflets from five improved varieties and one local variety of tomato. After collection, the leaflets were disinfected and inoculated in petri dishes on both sites of the midrib with Phytophthora infestans at concentrations of 1 x 107 conidium/mL. The commercial variety (Santa Cruz Kada Gigante) presented the lowest average infestation rate (50%) during the evaluation stage from time of inoculation up until 120 hours. After 120 hours, the leaflets of this variety also reached maximum infestation. A comparison of the study conditions to the scale of resistance values shows it must belong to a moderately resistant variety with horizontal resistance genes to this fungal disease.