DISTRIBUTION OF Corynothrips stenopterus Williams (THYSANOPTERA: THRIPIDAE) IN CASSAVA IN THE CENTRAL PROVINCES OF PANAMA
Keywords:
Chlorosis, identification, Manihot esculenta, mounting, thrips.Abstract
Thrips (Thysanoptera) include species that cause losses in the production of cassava (Manihot esculenta Crantz, 1766), one of the strategic important crops in Panama. The aim of this research was to determine the morphological characters, damage, and geographical distribution of C. stenopterus in cassava in the Pacific region of the central provinces of Panama. The study was developed during the period from january to december 2023. Sampling was carried out in 20 locations distributed in the central provinces of Panama (Coclé, Herrera, Los Santos, and Veraguas). Within each location, 20 plants were randomly selected, from which the leaves of the middle part of the plants were collected inside a plastic bag with hermetic seal. The samples were transferred to the laboratory to examine the damage on leaves and the number of immature instars and adults of the insect. Adult thrips were mounted on microslides to identify the species by using taxonomic keys. The species C. stenopterus was identified because it has got a dark head and pronotum, but also tergites III–IV and VII–X, with other yellow areas. Adults and immatures cause discoloration symptoms on the underside of the leaf. C. stenopterus is geographically distributed in the Pacific region of the central provinces of Panama and is also associated with the chlorosis of cassava leaves, but for its correct identification, it must be prepared on microslides to observe its characters.
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