Morphological, molecular and life-history homogeneity among local populations of Scirtothrips dorsalis hood (Thysanoptera: Thripidae) in the Philippines

Abstract

© 2018, College of Agriculture and Food Science, University of the Philippines Los Banos. All right reserved. Chico-chico in mango fruits, which has been reported only in mango-growing areas in Southern Mindanao, Philippines, has been known to be caused by the feeding of Scirtothrips dorsalis in young mango fruits. As chico-chico was not observed in other parts of the country, morphological, molecular, and biological studies were conducted to find evidences of variations among the local population of S. dorsalis in the Philippines. The local collection sites included Zambales, Bulacan, Laguna, Palawan, and Davao. Discriminant and cluster analysis of the various morphological characters measured showed no distinct differences among the local populations of S. dorsalis. In the molecular studies, the sequences from internal transcribed spacer 2 (ITS2) region of nuclear ribosomal DNA (rDNA) of the different local populations used were found to be 100% identical. Larval performance of the local populations collected from Davao and Laguna showed no significant difference in the development time from the first instar up to adult emergence. The total developmental period for Davao and Luzon were 8.86 and 8.88 d, respectively. Both oviposition and feeding were observed in young mango fruits by the tested populations in the field set-up. Further studies to determine population variation of S. dorsalis must be conducted on morphometric and molecular analysis using other morphological characters and other gene regions, respectively. Other behavioural studies such as greenhouse and field performance and host preference tests can also be done to verify the results of this study.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Page

271-278

Document Type

Article

Subject

Chilli thrips, Curcuma longa, Essential oils, Internal transcribed spacer 2 region, Lantana camara, Mango, Morphometrics pavonana, Population diversity, Repellency, Topical toxicity

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