Damage status and some biology characteristics of (Alcidodes sp.) snout weevil (Cinnamomum cassia L.J.Presl) and (Illicium verum Hook. F) in Vietnam

Abstract

Cinnamon and Star anise species are Vietnam's specialty plant. In this,
Cinnamon is mainly distributed in Yen Bai, Lao Cai, Lai Chau, Bac Kan,
Lang Son, Quang Ninh, Thanh Hoa, Nghe An, Quang Nam and Quang Ngai
provinces and Star anise is mainly distributed in Lang Son, Quang Ninh,
Bac Kan and Cao Bang provinces. Currently, Cinnamon plantations are
three years, and star anise plantations are five years have damaged adult and
larvae by significantly by the snout weevil. The species has scientific name
Alcidodes sp. belong to Mecysolobini, subfamily Molytiniae (Coleoptera:
Curculionidae). Adult male snout weevil was, on average 10.2 mm (± 0.2)
long, the female was bigger the male, the average length of 12 .5 mm (± 0.3),
body the whole body is greyish - brown, the branches in front of each side
have a strip of grey - white samples; elliptical eggs, 1.8 mm (± 0.1 mm)
long on average, milky white; the larva 1: Average length of 2.8 mm (± 0.2 mm),
white body and light brown head (Figure 2c); the larva of stage 2 on
average 6.4 mm (± 0.1 mm), pale milky white body, brown head; Lavar of
stage 3 are on average 10.7 mm (± 0.2 mm) long, light yellow body and
head dark brown to puce; pupa average 10.4 mm (± 0.1 mm) long, the body
is milky white.