Little has been published about the phytoseiid mite fauna of Thailand. This paper presents information about themorphology and distribution of phytoseiid mites collected in Thailand between 1991 and 2011 on different plant species,a list of the species presently known from that country, and a key for their identification. Twenty six species belonging to11 genera were collected and identified in this study, six of which are reported for the first time from Thailand. In total,38 species of phytoseiid species of 13 genera are reported, 29 of Amblyseiinae, seven of Phytoseiinae and two of Typhlodrominae.

We studied the distribution of the predatory phytoseiid mite, Neoseiulus longispinosus (Evans), in Thailand. The predator was distributed over the entire areas of the country throughout the year. It was found on 33 plant species ranging from perennial plants such as fruit trees to annual crops such as vegetables and ornamentals. N. longispinosus was abundant on plants infested with spider mites producing heavy webbing on the lower surface of leaves.

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