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Agricultural Insects of the Paraguayan Chaco1

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The results of a 13-month study of agricultural insects in a remote region of the Paraguayan Chaco are reported. The most serious general crop pests are leaf cutting ants, the migratory locust (Schistocerca paranesis Burm.), and spider mites (Tetranyehidac). Cotton insects were studied in the most detail, with the cotton leaf worm (Alabama argillacea (Hbn.)), the cotton bollworms (Heliothis spp.), the pink bollworm (Pectinophora gossypiella (Saund.)), and the cotton stainer (Dysdercus pallidus (Blote) considered as major pests. Oxycarenus hyalinipennis is present and possibly of considerable importance. Aphids, lacebugs, whitefly, a coreid, a lygaeid, a broad-nosed weevil, and a Diabrotica beetle are considered minor pests of cotton. A number of other phytophagous insects were found only occasionally on cotton.

Several species of caterpillars are important some years on peanut foliage. False spider mites (Tenuipalpidae) are suspected of causing fruit scarring on tangerines and causing a toxin disease of oranges. Several species of moths inflict severe damage to citrus and guava by their feeding punctures.

Climatic factors, particularly sporadic rainfall, and hot, dry, spring winds, as well as effective predation are considered phenomena responsible for the fact that some of the insect problems are less severe than those caused by the same pests elsewhere.

Document Type: Research Article

Publication date: October 1, 1958

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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