. Circular. Insects. 2 dent many years ago, probably from Europe, and now known to occur from New England to North Carolina and Wisconsin, attacks the clover plants in spring after they have made some growth and, in cases of ex- cessive abundance, leaves the ground as bare of clover in May as it was in December. It does not, however, injure the roots, and soon the plants spring up and the fields become as green with clover as before; the final result being that only the blooming is retarded. That tins delay is fatal to the midge has been shown, again and again, by the heavy crops of seed that
. Circular. Insects. 2 dent many years ago, probably from Europe, and now known to occur from New England to North Carolina and Wisconsin, attacks the clover plants in spring after they have made some growth and, in cases of ex- cessive abundance, leaves the ground as bare of clover in May as it was in December. It does not, however, injure the roots, and soon the plants spring up and the fields become as green with clover as before; the final result being that only the blooming is retarded. That tins delay is fatal to the midge has been shown, again and again, by the heavy crops of seed that have been secured from fields overrun with the weevils in May. A further complication is found in the fact that the. Fig. 1.âThe clover-leaf weevil (Phytonomus punctatus): a, egg; 1>. I>, b, b, larva- feeding; c, recently hatched larva: </. head of same from beneath; e, jaw of same: f, cocoon; g, meshes of cocoon; h, pupa; /.beetle: /'.same, in outline: /â , same, dorsal view; /, tarsus of beetle: m, antenna of same (h, /'. /', natural size; others more or less enlarged). (From Riley.) clover-leaf weevil does not become excessively abundant and eat off the clover every spring, because a fungous parasite attacks the larva1, causes them to die off by myriads, and thus keeps the insect greatly reduced in numbers. To summarize, the clover-seed chalcis attacks an important seed crop; but the flower midge destroys the ovaries before these have been fertilized by the bees and seed developed, thus checking the chalcis: the leaf weevil, however, eats off the clover plants in spring, so that blooming is delayed until after the midge is obliged to deposit its eggs, thus restricting its breeding; while the insect-destroying fungus keeps. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
