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FURTHER EXPERIMENTS IN THE CONTROL OF CERTAIN MAGGOTS ATTACKJNG THE ROOTS OF VEGETABLES
Author(s) -
SMITH KENNETH M.
Publication year - 1925
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1925.tb02257.x
Subject(s) - maggot , biology , gall , weevil , creosote , horticulture , toxicology , anthomyiidae , instar , larva , botany , pest analysis , chemistry , organic chemistry
SUMMARY. Experiments dealing with four species of root feeding maggots are described. The insects concerned are: Hylemyia antiqua , the onion fly; Psila rosae , the carrot fly; Chortophila brassicae , the cabbage root fly; and Ceuthorrhynchus pleurostigma , the turnip gall weevil. Control experiments on the first two have been carried on since 1920. A list of all the chemicals used in these trials is given. As a result of the 1924 experiments the following are recommended for use against onion fly: ( a ) nicotine sulphate dust, in a 5 per cent. mixture with precipitated chalk; ( b ) chlor‐cresylic acid, in a 1 per cent, mixture with precipitated chalk. After three seasons' trials creosote is not considered an efficient remedy for onion fly. For carrot fly: ( a ) nicotine sulphate dust in a 6 per cent. mixture; and ( b ) creosote, in a 1 per cent. mixture, both in chalk, gave promising results in the 1924 trials. Of chemicals wed in field trials against the cabbage root maggot the most successful were: (a) chlor‐cresylic acid, (b) green tar oil, (c) creosote. Anthracene oil and nicotine sulphate also gave fair results. A number of pot experiments, designed to test the efficacy of corrosive sublimate as a control for cabbage root maggot, were carried out. Results do not appear to justify the use of this substance as a remedy, but further trial is necessary. 400 cabbages, 200 galled by the larvae of the turnip gall weevil and 200 healthy, were grown under test conditions in order to ascertain the effect of these galls upon the health of the plant. The results of this experiment indicate that firstly the galls are attractive to slugs and secondly that the critical time in the life of a galled cabbage is the seedling stage, but that given good cultural conditions at the time of setting out, the cabbage will flourish normally.