. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . rafter the boughs, many must get destro^^ed on the ground. The caterpillar also feeds on other plants of the CabbageTribe, as the very common Jack-by-the-Hedge, WallMustard and others; and where the cocoons are observed ingreat quantities on large weeds by field sides, it would be wellto have the plants drawn or, where practicable, rough mowedand destroyed; also where, as sometimes happens, a crop istotally rui
. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . rafter the boughs, many must get destro^^ed on the ground. The caterpillar also feeds on other plants of the CabbageTribe, as the very common Jack-by-the-Hedge, WallMustard and others; and where the cocoons are observed ingreat quantities on large weeds by field sides, it would be wellto have the plants drawn or, where practicable, rough mowedand destroyed; also where, as sometimes happens, a crop istotally ruined, it would be well to plough it thoroughly in atonce before the moths could develop out of their cocoons, andfly to cause attack on neighbouring Turnip or Cabl)age fields. Turnip Sawfiy. Athalla tipindnim, Fab.; A. rr)ififuli(c, Panzer. The caterpillars of this Sawfiy, which are known undervarious names, as Blacks, Black Palmers, Niggers,&c., appear from time to time in very large numbers, and doserious damage, sometimes clearing the leafage of a whole TUENIP SAWFLY, 195 field of Turnips, excepting such of the veins as are too hardto be eaten, in the course of a few Athalia itpinai-xm : caterpillars, i^upa, and pupa-case. Sawfly, magnified,with lines showing nat. size. Taking the dates of some attacks which are especiallyrecorded, we find them noticed in 175G, 17G0, 1782, 1806,1818, 1833, 1835, and the following years up to 1838; in 1782it was estimated that about two-thirds of the Turnij)-groundin Norfolk had consequently to be ploughed and re-sown; butthe worst attack recorded took place in the dry summer of1835, when the injury to the Turnips extended as far northas Durham; and in the southern counties, from Somerset toKent, the crop was a failure, the second and even the thirdsowing being devoured by these Niggers. The only occasion on which I have seen the attack myself—and then only as occurring to a slight extent—was on a Turnipfield at the top of the cliff
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Keywords: ., bookcentury1800, bookdecade1890, bookidmanualofinju, bookyear1890
