Comparison of Feeding Damage Caused by Four Tetranychid Mite Species on Gas-exchange Rates of Almond Leaves

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Abstract
A dual-isotope porometer measured gas-exchange rates on almond leaves exposed to feeding damage by Panonychus citri, P. ulmi, Tetranychus pacificus, or T. urticae. The feeding injury of all four mite species caused significantly lower rates of stomatal conductance, mesophyll conductance, and photosynthesis compared with undamaged controls. No significant differences in gas-exchange rates occurred between species within either genus; however, significant differences between genera were detected. Tetranychus spp. caused lower rates of mesophyll conductance and photosynthesis when compared with Panonychus spp.

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