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Leaves, tannin test

Leaf Disk Test Bioassay of Effect of Tannins on Insect Feeding Behavior... [Pg.105]

We will perform the Leaf disk test, also known as leaf disk assay or leaf disk choice test, the second of two bioassays of tannins in the diet of insects in this book. In this often used bioassay, leaf sections of a standard size are treated with the compound(s) in question. Several circular leaf sections ( leaf disks ) (Ali et al. 1999, Filho and Mazzafera 2000, Shields et al. 2008, Wheeler and Isman 2000) or cellulose membrane filters (Hollister and Mullin 1999, Larocque et al. 1999) are presented to a caterpillar in a choice experiment. We measure how much chow the caterpillar has consumed and whether any feeding inhibition is concentration dependent. Regardless of what compounds are being tested, leaf disk tests serve as an important tool in bioassaying feeding inhibitors and stimulants in insects. The cited references are examples of such studies. (In the first tannic acid experiment - Chap. 18 - the tannic acid was mixed into diet in varying concentrations.)... [Pg.106]

We will perform one of the two bioassays dealing with tannins in insect diet The compounds to be tested (tannic acid) are mixed into diet in varying concentrations. We measure how much chow the caterpillar has consumed and whether the effect is concentration dependent. (The second bioassay - in Chap. 19 - employs the Leaf disk lest. In this often used bioassay leaf sections of a standard size are treated with the compounds in question.)... [Pg.102]

The low efficiencies of S. eridania on all tree leaves tested (see Fig. 7.5) may be the result of a variety of factors (e.g., low leaf water, low nitrogen, high fiber, high tannin concentrations). The growth rates on trees generally remain... [Pg.169]


See other pages where Leaves, tannin test is mentioned: [Pg.169]    [Pg.35]   
See also in sourсe #XX -- [ Pg.82 ]




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