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Abstract
Assays were conducted throughout a wide pH range to measure the ability of extracts from third instar boll weevil larvae to degrade pectic substances. Pectin was deesterified and was depolymerized by both hydrolytic and trans-eliminative mechanisms. Sodium polypectate (deesterified pectin, or pectic acid) was depolymerized solely by trans-elimination. Addition of Ca 2+ failed to stimulate the trans-eliminative cleavage of either pectin or polypectate. It is possible that one or more of the pectinases from boll weevil larvae contribute to the abscission of infested cotton flower buds.
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