Respiration of the two spotted spider mite as affected by leaf nitrogen
Wermelinger, B.
Spider mites (Tetranychus urticae) were reared individually on leaf discs of apple trees fertilized with three different N levels. Leaf N content, absolute and relative (metabolic) respiration rates as well as dry weight of female mites were determined. Mean absolute and relative (per μg body dry weight) respiration rates increased by ca 35% (absolute rate) and 25% (relative rate), respectively at high leaf N. Both respiration rates as well as spider mite dry weight were correlated with N content of the leaves. In a range of 1.8 to 3.0% leaf N, absolute and relative respiration increased by 68% and 40%, respectively. The energy used for respiration per hour averaged 0.8–1.0% of the energy of the female biomass.
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