Comparison of morphology, pathogenicity, and reproductive fitness of Meloidogyne enterolobii (Yang and Eisenback, 1983) and M.incognita (Chitwood, 1949) on selected papaya varieties

Date

4-2014

Degree

Bachelor of Science in Agriculture

Major Course

Major in Plant Pathology

College

College of Agriculture and Food Science (CAFS)

Abstract

The research internship was done at the Nematology Laboratory, Crop Protection Cluster, UPLB from June 2013 to March 2014. During this period, the intern went to guapple farms in Caba and Bauang, La Union with the adviser and became familiar with the symptoms of guava decline caused by Meloidogyne enterolobii, a newly recorded species in the Philippines. The guava root-knot nematode (RKN) was compared with M. incognita, the common species, in terms of morphology, as well as pathogenicity and reproductive fitness in papaya in a greenhouse experiment. Three papaya varieties were inoculated with 5,000 eggs of either species per plant. Eight weeks after inoculation, results showed that shoot height, shoot weight and root weight were not significantly different between inoculated and uninoculated plants. The papaya also did not exhibit root galls and no mobile stages were extracted from the soil. Absence of the symptoms caused by the two RKN can be explained by many factors such as non-host status, race of root-knot species, and experimental conditions. Meloidogyne enterolobii and M. incognita resemble each other in terms of perineal pattern morphology. They, however, can be differentiated by a few morphometric characters of second-stage juveniles. Examination of 15 slide mounted J2 of each species showed that they can be differentiated based on stylet length, body length, and tail length with the former having relatively longer measurements. They also have very different tail tip morphology. Species identification is a critical input to nematode management, hence, must be carefully and accurately done.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993 2014 A3 /J83

Document Type

Thesis

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