Effect of variation in photoperiodic response on diapause induction and developmental time in the willow leaf beetle, Plagiodera versicolora

2000 ◽  
Vol 96 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Michihiro Ishihara
Keyword(s):  
Developmental Time ◽  
Leaf Beetle ◽  
Photoperiodic Response ◽  
Diapause Induction ◽  
Plagiodera Versicolora ◽  
Willow Leaf Beetle

scholarly journals Contribution to the knowledge of development and harmfulness of imported willow leaf beetle (Plagiodera versicolora) (Coleoptera, Chrysomelidae)

2012 ◽  
Vol 51 (No. 11) ◽  
pp. 481-507 ◽  
Author(s):  
J. Urban
Keyword(s):  
Food Consumption ◽  
Growing Season ◽  
Leaf Beetle ◽  
Egg Laying ◽  
Plagiodera Versicolora ◽  
Salix Fragilis ◽  
Willow Leaf Beetle ◽  
Whole Egg

The paper deals with the occurrence, development and harmfulness of imported willow leaf beetle (Plagiodera versicolora Laich.) in riparian and accompanying stands of the Svratka and Svitava rivers in the region of Brno. Salix fragilis L. and S. &times; rubens Schr. are the most damaged species there. Imagoes leave wintering places usually at the beginning of May. During about a 60-day period, they damage ca. 23.3 cm<sup>2</sup> leaves of S. fragilis and lay 250 to 730 (on average 539) eggs. The whole egg-laying consists of 16 to 48 (on average 35.5) groups with 6 to 26 (on average 15.2) eggs. The fecundity of females hatched in the laboratory is minimally twice lower. Larvae hatch after 5 to 8 (in the laboratory after 4.3) days and damage about 282 mm<sup>2</sup> leaves. The development from laying eggs until hatching imagoes of the <br />1<sup>st</sup> generation takes about 21 (in the laboratory about 15) days. Imagoes of the 1<sup>st</sup> generation occur on trees from the end of May to mid-August and die after completing their reproduction. Plagiodera versicolora creates 3 to 4 (in the laboratory 4 to 6) generations during a year. The small part of imagoes of the 2<sup>nd</sup> generation, predominant part (or all) imagoes of the 3<sup>rd</sup> generation and under conditions of a tetravoltine development all imagoes of the 4<sup>th</sup> generation enter a diapause. In the course of the growing season, the food consumption of imagoes and larvae decreases and fecundity of females markedly decreases. Schizonotus sieboldi (Ratz.), Medina melania (Meig.) and M. luctuosa (Meig.) rank among main enemies of Plagiodera versicolora.

Factors contributing to the seasonal occurrence of the willow leaf beetle Plagiodera versicolora

2005 ◽  
Vol 47 (2) ◽  
pp. 99-105 ◽  
Author(s):  
Sawako Egusa ◽  
Takayoshi Nishida ◽  
Kenji Fujisaki ◽  
Hiroichi Sawada
Keyword(s):  
Leaf Beetle ◽  
Seasonal Occurrence ◽  
Plagiodera Versicolora ◽  
Willow Leaf Beetle
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