Effects of Blower-Type Insect Trapping Treatment during the Growth Period of Second Tea Crop on Occurrences of Insect Pests, Yields and Qualities of Tea

Miyama, Daisuke; Yoshida, Katsuyuki; Sato, Yasushi; Sumikawa, Osamu; Araki, Toshimitsu; Miyazaki, Masahiro

doi:10.4035/jsfwr.44.81

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“…A plastic tray (210 × 297 mm) was placed under the edge of a plot, the leaf layer was beat 5× with a wooden stick (1 m long, 3 cm diameter), and the leafhoppers that fell on the tray were counted. The beating method is useful to count tea green leafhoppers (Kosugi, 1997) and the method has been used commonly (e.g., Mochizuki et al., 1994; Miyama et al., 2009).…”

Section: Methodsmentioning

confidence: 99%

“…To assess feeding damage, 10 shoots were collected from each plot and damage was scored for the leaves of every shoot. We scored feeding damage on a three‐class visual scale traditionally accepted by Japanese tea pest researchers (e.g., Miyama et al., 2009): 0 (no damage), 1 (light damage: vein reddening), and 2 (severe damage: leaf margin yellowing or leaf curling).…”

Section: Methodsmentioning

confidence: 99%

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Field evaluation of resistance to tea green leafhopper, Empoasca onukii, in tea plant

Yorozuya

Sudo

Sato

2021

Entomologia Exp Applicata

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The tea green leafhopper, Empoasca onukii Matsuda (Hemiptera: Cicadellidae, Typhlocybinae), is a serious pest of tea plants in East Asia. In the laboratory, tea genotypes CA278, Cd19, and Cd289 [Camellia sinensis (L.) O. Kuntze (Theaceae)] sustain fewer feeding damage symptoms known as hopperburn than the susceptible cultivar ‘Yabukita,’ and E. onukii excretes less honeydew on them than on Yabukita. Here, we evaluated whether these genotypes have practical and sufficient resistance under field conditions. The densities of E. onukii eggs, larvae, and adults on tea shoots and the degree of feeding damage were compared as indicators of resistance. Genotypes Cd19 and Cd289 showed strong resistance and CA278 showed moderate resistance under field conditions. Therefore, Cd19 and Cd289 are favorable materials for breeding tea cultivars with resistance to tea green leafhopper. We propose selection methods for breeding new resistant tea cultivars.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%