Oviposition and larval survival of Dasineura tetensi on four blackcurrant Ribes cultivars |
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Authors: | D.J. Crook J. Cross A.N.E. Birch R.M. Brennan A.J. Mordue |
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Affiliation: | (1) Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, Scotland UK;(2) Horticultural Research International, East Malling, Kent, ME19 6BJ, UK;(3) Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, Scotland UK |
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Abstract: | Monitoring of an unsprayed infested fieldsite using watertraps in S.E. Kent revealed four generations of Dasineura tetensi (Rubs) (Diptera: Cecidomyiidae) occurring between April and September 1996. Ribes nigrum L. cultivars 'Baldwin' (susceptible), 'Ben Alder' (susceptible) and 'Ben Connan' (resistant) were sampled for eggs in the field and assessed for midge damage throughout the season. Oviposition was indiscriminate, but plant damage varied significantly between cultivars. In laboratory choice experiments, mated female midges showed no preference between susceptible shoots of 'Ben Alder' and resistant shoots of 'Ben Connan' for oviposition. Olfactory responses of D. tetensi to leaf volatiles of 'Ben Alder' and 'Ben Connan' were also tested in a 4-way olfactometer. Mated females did not discriminate between volatiles of susceptible and resistant host plants. Larvae reared on cv. 'Ben Connan' shoots were significantly smaller than those reared on shoots of cv. 'Ben Alder'. Larval antibiosis and not female antixenosis appears to be the main mechanism for resistance to D. tetensi in 'Ben Connan'. |
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Keywords: | Dasineura tetensi plant resistance antibiosis antixenosis blackcurrant midge |
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