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Effect of Rice Cultivar Height on Infestation by the Least Skipper, Ancyloxypha numitor (F.) (Lepidoptera: Hesperiidae)1

1983; Oxford University Press; Volume: 12; Issue: 3 Linguagem: Inglês

10.1093/ee/12.3.967

1938-2936

C. Michael Smith, J. F. Robinson,

Agricultural pest management studies

Populations of immature Ancyloxypha numitor (F.) were monitored in 1979 and 1981 on three dwarf (60 to 75 cm) and three tall (118 to 122 cm) cultivars of rice. Significant (P < 0.05) differences in the number of A. numitor larvae per 100 tillers (1979) and the number of eggs, larvae, and total immatures per 100 tillers (1981) were noted between dwarf and tall cultivars. Similarly, a significant (P < 0.05) negative correlation existed between eultivar height and x total larvae (r = −0.85,4, df), and a highly significant (P < 0.01) negative correlation existed between cultivar height and x total pupae (r = −0.92, 4 df). The hymenopterous parasites Agathis n. sp., Pediobus n. sp., and Elachertus n. sp. were recovered from infested A. numitor larvae. Overall, A. numitor parasitism varied from 3.7 to 48.0%. Agathis n. sp. was the dominant parasite, comprising from 72 to 100% of the total parasite population. The increased A. numitor immature populations and defoliation on the dwarf rice cultivars evaluated here suggest the need for identification and development of dwarf eultivars with A. numitor resistance.