Effect of Willamette Mite and Pacific Spider Mite (Acari: Tetranychidae) on Grape Photosynthesis and Stomatal Conductance

@inproceedings{Welter1989EffectOW,
  title={Effect of Willamette Mite and Pacific Spider Mite (Acari: Tetranychidae) on Grape Photosynthesis and Stomatal Conductance},
  author={Stephen C. Welter and Delbert S. Farnham and Philip S. McNally and Roger Brett Freeman},
  year={1989}
}
Feeding damage by Pacific spider mite, Tetranychus pacificus (McGregor), or Willamette mite, Eotetranychus willametti (McGregor), was shown to reduce grape leaf photosynthesis and stomatal conductance. Negative linear regressions between feeding damage and grape leaf gas exchange were developed for both species of mites (P < 0.01). Both mite species appear to have comparable effects on field photosynthetic rates and stomatal conductance of grapevines. Photosynthetic rates of undamaged adjacent… CONTINUE READING

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