• Title/Summary/Keyword: Wild silkmoth

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Collection and Characteristics of the Wild Silkmoth, Samia cynthia pryeri, in Korea

  • Kim, Bo-Youn;Park, Young-Whan;Park, Nam-Sook;Lee, Sang-Mong
    • International Journal of Industrial Entomology and Biomaterials
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    • v.3 no.1
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    • pp.101-103
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    • 2001

  • The wild silkmoth, Samia cynthia pryeri, was firstly collected at Miryang, Korea. The development and quantitative characters of S. cynthia preyri in the laboratory condition were analysed. The larval body color of dark yellow green or light yellow green of the S. cynthia pryeri was changed into white color during the molting period, and the yellowish bristles in younger larvae were changed into fade green color in advanced stage larvae. Aralia elata and Zanthoxylum piperitum were newly identified as host plants to S. cynthia pryeri. Cocoon weight and cocoon shell percentage were average 2.14 g and 12.3 %, respectively. In addition, the morphology of the silkgland was different from that of the domestic silkworm,Bombyx mori, but was identical with that of the wild silkmoth, Antheraea yamamai.

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Effect of Parasitoids' Exit and Predators' Ingress Holes on Silk Yield of the African Wild Silkmoth, Gonometa Postica Walker (Lepidoptera: Lasiocampidae)

  • Fening, Ken Okwae;Kioko, Esther Ndaisi;Raina, Suresh Kumar
    • International Journal of Industrial Entomology and Biomaterials
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    • v.19 no.2
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    • pp.265-268
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    • 2009

  • Wild silkmoths can be utilised sustainably in the production of silk as an income for resource-poor rural communities. However, attack by parasitoids and predators affect the quality of cocoons and quantity of raw silk produced. A laboratory experiment was undertaken to quantify the effect of parasitoids' (dipteran and hymenopteran) and predators' (ants) exit and ingress holes, respectively, on silk production. The mean number of shells required to produce fifty grams of raw silk was highest with cocoons parasitised by a dipteran and lowest with unattacked cocoons (but with moths already emerged). Degumming loss was highest in parasitised and lowest in unttacked cocoons, but both were not different from cocoons predated by ants. Shell weight was highest in unattacked cocoons, followed by hymenopteran-parasitised and predated cocoons, with the dipteran parasitized ones being the least. Single cocoon weight was greater in hymenopteran-parasitised and predated cocoons than the dipteran-parasitised and unattacked cocoons. Shell ratio or raw silk, floss and yarn weights were higher in unattacked than parasitised and predated cocoons. The total loss in raw silk attributable to attack by parasitoids and predators ranged between 17.4~31.2%. The results offer baseline information for assessment of economic losses in wild silk farming due to parasitoids and predators in the field.

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Developmental and Morphological Characterization of the Wild Silkmoth, Actias gnoma, in Korea

  • Ryu, Chun-Woo;Kim, Mi-Ae;Park, Nam-Sook;Sohn, Hung-Dae;Park, Sang-Bong;Lee, Ho-Oung;Moon, Jae-Yu;Seong, Su-Il
    • International Journal of Industrial Entomology and Biomaterials
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    • v.5 no.1
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    • pp.79-83
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    • 2002

  • The wild silkmoth, Actias gnoma was firstly collected at Suwon located in the middle part of Korea. The developmental and morphological characteristics of A. gnoma reared under the laboratory conditions were analysed. The egg shape was shorter elliptic. The major and minor diameter of the eggs were 2.04 mm and 1.83 mm, respectively. White mucous material was remained inside the eggs after hatching. Also, the body color of the larvae was completely changed from dark brown to light yellowish-green at the 3rd instar, but it did not occur until pupation. In the feeding test on several plants, the oak tree, Quercus acutissima, was newly identified as a host plant. The final larval instar was mostly 6th, but in some larvae it was 7th. A few of larvae ate their own casts just after ecdysis. The whole larval duration ranged from 45 to 59 days. The single cocoon weight, cocoon shell weight and cocoon shell percentage were 1.65 g,31.3 cg and 18.9%, respectively, The cocoon shape and color were spindle and light brown, respectively. The morphology of the silk gland was greatly different from those of Bombyx mori, Antheraea yamamai and Antheraea peryi: the thickness of the middle and posterior silk glands was almost identical.

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Breeding of Major Characteristics of the Wild Silkmoth, Antheraea yamamai indoor-and outdoor-reared (실내외 사육에 의한 천잠 우량계통 육성)

  • Yoon, Hyung-Joo;Kang, Pil-Don;Kim, Sam-Eun;Lee, Sang-Mong
    • Journal of Sericultural and Entomological Science
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    • v.48 no.2
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    • pp.61-67
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    • 2006

  • We investigated fertilization rate, hatchability rate, pupation rate and cocoon quality etc to selecting good characteristics of the wild silkmoth, Antheraea yamamai using method of indoor-and outdoor-rearing. As results of indoor rearing, the healthiness of A. yamamai was better in light green colour strain than that of dark green colour strain, but cocoon quality was better in dark green colour strain. There was a little effect to selecting major characteristics in grade of A, B and C strain classified with cocoon weight. $F_1$ hybrid was lower in fertilization rate and hatchability rate than parent, but higher in pupation rate and cocoon quality. There was no effect of heterosis in $F_2$ hybrid. In case of outdoor rearing, mortality rate was lower than that of indoor rearing but missing larva was higher. In addition, outdoor rearing is higher that indoor rearing in cocoon weight, cocoon shell weight and cocoon shell rate.

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