Distribution and Abundance of a Stem Weevil, Cylindrocopturus adspersus (Coleoptera: Curculionidae), in Cultivated Sunflower in the Northern Plains

  title={Distribution and Abundance of a Stem Weevil, Cylindrocopturus adspersus (Coleoptera: Curculionidae), in Cultivated Sunflower in the Northern Plains},
  author={Laurence D. Charlet},
  journal={Environmental Entomology},
  • L. Charlet
  • Published 1 October 1983
  • Biology
  • Environmental Entomology
Larvae of a stem weevil, Cylindrocopturus adspersus (LeConte), overwintered in sunflower stalks in North Dakota, South Dakota, and Minnesota in 1979 and 1980. Population levels averaged 2.0 and 1.6 larvae per stalk in 1979 and 1980, respectively. The highest number of overwintering larvae per stalk occurred in North Dakota. About half of the stalks from each sampled field were infested with larvae. There was no correlation between stalk diameter and number of larvae per stalk. Overwintering… 
Sunflower stem weevil and its larval parasitoids in the Central and Northern Plains of the USA
The reduced number of parasitoid species foundattacking C. adspersus in the northern Plains may be caused by low host population levels, slow migration by parasitoids into theregion, or lack of adaptation to climaticconditions.
Distribution and abundance of the sunflower stem weevil, Cylindrocopturus adspersus (Leconte) (Coleoptera: Curculionidae), in Saskatchewan.
The sunflower stem weevil infests wild and cultivated sunflowers in Colorado, Texas, North Dakota, South Dakota, and Minnesota and was first observed in Saskatchewan in a sunflower test plot near Carnduff, in August 1984 (unpublished data).
Methods for assessing infestations of sunflower stem weevil (Coleoptera: Curculionidae) in sunflower stems
Results suggest for large field trials with sunflower stem weevils, digital X-rays provide much more time-efficient larval population estimates, and use of small emergence boxes to estimate weevil populations was similarly time efficient.
Nonlinear Degree-Day Models for Postdiapause Development of the Sunflower Stem Weevil (Coleoptera: Curculionidae)
Using data collected in Colorado, Kansas, and Nebraska, predictable variation between C. adspersus pupation, adult eclosion, and emergence and accumulated degree-days Celsius (DD) was sought by using a temperature threshold of 5°C.
Initial screening of the stem-boring weevil Osphilia tenuipes, a candidate agent for the biological control of Bryophyllum delagoense in Australia
A stem-boring weevil from Madagascar was screened in South Africa to determine its potential as a biological control agent for Bryophyllumdelagoense in Australia and results revealed it could oviposit and develop to adulthood on seven non-target species in the family Crassulaceae, without an obvious loss offitness on four of those species.