. Insects affecting vegetables [microform]. Légumes; Vegetables; Insect pests; Insectes nuisibles. V 28 is, however, a sjimple method of protection which has been found effec- tive : as soon as the tiny shoots of the onions begin to appear above the soil, the rows should be treated with a whitewash made of lime and water and thick enough to form a thin crust over the surface. The effect of this is to close up all crevices and openings in which the parent fly would lay her eggs, and prevent the maggots which may hatch from any eggs laid above ground from reaching the roots beneath. The young p
. Insects affecting vegetables [microform]. Légumes; Vegetables; Insect pests; Insectes nuisibles. V 28 is, however, a sjimple method of protection which has been found effec- tive : as soon as the tiny shoots of the onions begin to appear above the soil, the rows should be treated with a whitewash made of lime and water and thick enough to form a thin crust over the surface. The effect of this is to close up all crevices and openings in which the parent fly would lay her eggs, and prevent the maggots which may hatch from any eggs laid above ground from reaching the roots beneath. The young plants penetrate through the thin crust of lime without difficulty. Later on, when hoeing, any plant that is not growir>g satisfactorily should be cut out and crushed under foot so as to destroy the maggots. Furthermore, onions should not be grown a second time on, or close to, a bed which has been infested with these insects. Pyrethrum insect. Fig. 38. Union Muggot, pnparium, fly snd infested bulb. ft â n I i powder or white hellebore may be applied in the same manner as recom- mended for the cabbage maggot. Many other substances, such as salt, plaster, Paris green, &'c., have been tried without any satisfactory results. When taking up the onions in the fall any bulbs infested by maggots should be carefully destroyed. Parsnip. The Parsnip Webworm {Depressaria heracliana). When parsnips are left in the ground all winter and allowed to grow up for seed-bear- ing purposes durinjj the following season, they are very liable to be attacked by this insect. Towards the end of June when the stems are tall and bear fine umbels of flowers, it is often found that the bloom is disfigured with webs which draw the whole into an untidy mass, and on examination a colony of small caterpillars will be found at work within. W'hen they have finished consuming the flowers, they burrow. Please note that these images are extracted from scanned page images that may have been digitally enhance
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