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Stadial susceptibility of eastern spruce budworm choristoneura fumiferana lepidoptera tortricidae to the insect growth regulator dimilin



Stadial susceptibility of eastern spruce budworm choristoneura fumiferana lepidoptera tortricidae to the insect growth regulator dimilin



Canadian Entomologist 109(6): 893-894



The precise EC50 [median effective concentration] values for Dimilin and relative susceptibility during all stadia have been established. Spruce budworm larvae became more susceptible to Dimilin with each successive molt. The 2nd instar (the first instar does not feed) was least affected and the 6th was the most affected. The EC50 values decreased by a factor averaging 0.45-0.07 SD for each stadium. The high EC50 value for spruce budworm may in part explain the poor control achieved with Dimilin in field tests (Dimond 1975). Based on the stadial susceptibility, testing of Dimilin in the field during the more susceptible 5th and 6th stadia seems warranted, rather than the conventional 3rd and 4th stadia. Retnakaran and Smith (1975) noted that 6th instars treated with Dimilin produced abnormal pupae typical of juvenile hormone analogue treatments. This finding, with the data presented in this report showing that larvae become more susceptible with age, indicates that Dimilin may have more than one mode of action against spruce budworm. Other insects should similarly be treated with Dimilin at more than one larval stadium to determine the most susceptible period for treatments.

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Accession: 006471188

Download citation: RISBibTeXText

DOI: 10.4039/ent109893-6


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