Thrips and fungal pathogens associated with garlic in MMSU [Mariano Marcos State Univ.]-Batac, Ilocos Norte [Philippines]
2019
Reyes, C.P. | Mintu, C.B. | Dalisay, T.U.
Thrips known as 'kulisipsip' are small insects that feed on leaves, flowers and fruits of plants by using their piercing and sucking mouthparts. Their feeding and oviposition injury allow bacteria, fungi, and viral pathogens to enter the plant tissues. The study aimed to determine the species of thrips infesting garlic ''Ilocos white'' and fungal pathogens they harbor in the Experimental Area of Mariano Marcos State University. The study was conducted from January to May 2019. Samples were collected randomly in about 200m plot when plants were at the late vegetative stage by shaking and beating plants on the white board. Specimens were sorted, cleared, mounted on glass slides and identified using light microscope. Findings showed that Thrips tabaci Lindeman, a terebrantian known as vector of onion Iris yellow spot virus, tomato spotted wilt virus, tomato yellow fruit ring virus, and garlic common latent virus in other countries, and Haplothrips gowdeyi Franklin, a known flower dwelling tubuliferan, were infesting garlic plants. Females and larvae of T. tabaci were present in almost all plant samples but no male was found. This implies that T. tabaci is a major pest of garlic and the population was reproducing parthenogenetically. H. gowdeyi were found in low population probably due to absence of flowers. Moreover, the culture and isolation of fungi from selected T. tabaci harbored Fusarium spp., Curvularia spp. and Trichoderma sp. Findings showed that garlic plants in the study area were probably infected with Fusarium garlic bulb rot and Curvularia leaf spots. Trichoderma sp. is probably non-pathogenic. In the light of these findings, monitoring and identification of thrips and fungal pathogens using molecular techniques in garlic farms are recommended.
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