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Differences in Susceptibility of Tea Clones in Ceylon to the Shot‐Hole Borer Beetle, Xyleborus fornicatus Eichh. (Coleoptera: Scolytidae) 1

1971; Wiley; Volume: 68; Issue: 1-4 Linguagem: Inglês

10.1111/j.1439-0418.1971.tb03156.x

0044-2240

D. Calnaido,

Insect and Pesticide Research

Abstract Xyleborus fornicatus , the shot‐hole borer beetle of Tea is a serious pest of the crop in Ceylon. However, tea plants raised vegetatively from various clones, show various degrees of susceptibility and/or tolerance to the borer beetle infestation. This has been investigated for the last five years and the results from five experiments, dealing with 77 different ‘types’ of tea plants, are reported here. Tolerance to borer infestations is only one desirable quality of tea clones; and such tolerant clones have also to be high yielding clones, which are able to resist drought conditions as well and produce a manufactured tea of good quality. A list of the graded characteristics of the 77 ‘types’ of tea plants is provided. It is shown, conclusively, that TRI 2023 and DG 39 are the best clones, and clone W 3 shows promise, in respect of their high degree of tolerance to the borer beetle, and also possess the other desirable characeristics, for their propagation in the mid‐country tea districts of Ceylon. Zusammenfassung Unterschiede in der Anfälligkeit von Tee‐Klonen in Ceylon für Xyleborus fornicatus Eichh. (Col.: Scolytid.) Fünfjährige Experimente zeigten, daß die verschiedenen Klone der Teepflanze auf Ceylon verschieden anfällig gegen den Befall des Borkenkäfers Xyleborus fornicatus sind. Gegen den Borkenkäfer resistente Klone haben nur dann wirtschaftlichen Wert, wenn sie zugleich andere Eigenschaften (hohe Qualität, Resistenz gegen Trockenheit) besitzen. Es wird eine Liste der abgestuften wirtschaftlichen Wertigkeiten von 77 ceylonistischen Tee‐Klonen gegeben. Von ihnen zeigten die Klonen TRI 2023 und DG 39 die beste Kombination von Eigenschaften einschließlich der Resistenz gegen Borkenkäfer, während Klon W3 gute Aussichten hat