Localized outbreak of a willow leaf beetle: plant vigor or natural enemies?

2000 ◽  
Vol 42 (1) ◽  
pp. 0091
Author(s):  
C. Björkman ◽  
B. Bengtsson ◽  
H. Häggström
Keyword(s):  
Natural Enemies ◽  
Leaf Beetle ◽  
Plant Vigor ◽  
Willow Leaf Beetle

Localized outbreak of a willow leaf beetle: plant vigor or natural enemies?

2000 ◽  
Vol 42 (1) ◽  
pp. 91-96 ◽  
Author(s):  
C. Bj�rkman ◽  
B. Bengtsson ◽  
H. H�ggstr�m
Keyword(s):  
Natural Enemies ◽  
Leaf Beetle ◽  
Plant Vigor ◽  
Willow Leaf Beetle

An Artificial Diet for Cottonwood and Imported Willow Leaf Beetles (Coleoptera: Chrysomelidae) and Comparative Performance on Poplar Foliage2

1990 ◽  
Vol 25 (3) ◽  
pp. 475-480 ◽  
Author(s):  
Leah S. Bauer ◽  
Joann Meerschaert ◽  
O. Thomas Forrester
Keyword(s):  
Artificial Diet ◽  
Leaf Beetle ◽  
Adult Longevity ◽  
Comparative Performance ◽  
Laboratory Rearing ◽  
Leaf Beetles ◽  
Chrysomela Scripta ◽  
The Media ◽  
Cottonwood Leaf Beetle ◽  
Willow Leaf Beetle

An artificial diet was developed for laboratory rearing of the cottonwood leaf beetle, Chrysomela scripta F., and the imported willow leaf beetle, Plagiodera versicolora (Laicharting). To reduce microbial contamination of the media, procedures were developed for separating egg masses and sterilizing egg surfaces. Cottonwood leaf beetle larvae reared from neonate to adult on this artificial diet had greater mortality, took longer to develop, and were smaller than larvae reared on fresh poplar foliage. Adult longevity was similar for both diet-and foliage-reared larvae. Survival and adult fresh weight of imported willow leaf beetle larvae reared on the artificial diet were similar to those of cohorts reared on fresh poplar foliage. However, individuals reared on artificial diet took longer to develop and produced shorter-lived adults than cohorts reared on foliage. Larvae of both species would not eat fresh foliage after being fed on the artificial diet. Adults of both species maintianed on the artificial diet laid few eggs but resumed normal oviposition when fed fresh foliage. This artificial diet proved useful for rearing larvae and maintaining adults during periods when fresh foliage was limited.

Fatty Acid Profiles of Main Lipid Classes in Adult Chrysomela vigintipunctata (Scopoli) (Coleopterai:Chrysomelidae)

2000 ◽  
Vol 55 (7-8) ◽  
pp. 661-666 ◽  
Author(s):  
Nelly Nikolova ◽  
Tomas Rezanka ◽  
Boryana Nikolova-Damyanova
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Free Fatty Acids ◽  
Monounsaturated Fatty Acids ◽  
Carbon Chain ◽  
Leaf Beetle ◽  
Polar Lipids ◽  
Total Lipid Extract ◽  
Branched Chains ◽  
Willow Leaf Beetle

Abstract The fatty acid composition of the willow leaf beetle Chrysomela vigintipunctata (Scopoli) (Coleoptera: Chrysomelidae) is presented in this paper. Fatty acids in the total lipid extract, triacylglycerols, free fatty acids and polar lipids were compared. One hundred and fifteen fatty acids were identified in the total lipids. The mixture comprised compounds with normal and branched-chains of 12-30 carbon atoms and zero to six double bonds in different positions in the carbon chain. Substantial amounts of unsaturated eicosanoic fatty acids known as important precursor of eicosanoids in insects were detected in the lipids as were biologically significant positionally isomeric dienes, trienes and tetraenes of the series (n-3) and (n-6) of C16, C18, and C22 fatty acids. Also present was a mixture of hydroxy-FA. Triacylglycerols contained mostly saturated and monounsaturated fatty acids. Polyunsaturated fatty acids were found mostly in free fatty acids and especially in polar lipids.

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