Mean percent consumption of P. bombycina per mi-nute by ANT and MAX larvae was reduced in comparison to that of UNI larvae (Figure 2B–D). Twenty five numbers dfls of Antheraea assamensis …
You currently do not have any folders to save your paper to! Please check for further notifications by email. The relative acceptability of host plants for adult oviposition by herbivorous insects is determined by a balance of numerous internal and external stimulants and deterrents (Miller and Strickler 1984, Bossart and Scriber 1999). Then the supernatant was collected after filtration followed by centrifugation (5,000 rmp for 10 minutes). 2008, Mercader and Scriber 2008), suggesting that even after millions of years of specialization, behavioral and detoxification abilities still exist for plants that have never been encountered. FC
2001), every insect species may be considered to have its own key (Schoonhoven and Loon 2002). Schaafsma
Attraction and biting response of the muga silkworm towards different chemicals.
Muga silkworm host plant. M
For the NONE larvae, the mean consumption per minute was higher during the consumption of the non-host and water disk.
per treatment. Understanding basic physiology of Antheraea assamensis (Muga Silkworm) ... different host plant, etc.) 1997). The blend of vola-tile chemicals released by host plants either as constitutive or induced defense (Turling et al.
Attraction and feeding tests with detached leaves and artificial diet with different chemical stimulants revealed that a mixture of the flavonoids, myrcetin, and 7, 2', 4' trimethoxy dihydroxy flavone with sterol compound β-sitosterol elicited the most biting behavior by A. assamensis larvae. The homogenate was centrifuged at 12,000 G for 20 minutes and the supernatant was used as a crude enzyme source. C
However, a drastic reduction in survivability was observed during late 5th instar.
Preference based on mean percent consump-tion per minute was analyzed by one (p < 0.025) and two (p < 0.05) tailed Mann-Whitney tests. ALL, UNI, ANT, and MAX larvae opted for L pol-yantha (p < 0.025). It is a polyphagous insect feeding on a wide range of plants. Rearing of Antheraea assamensis Heifer (Muga) on Persea bombycina King (Som) and Litsea polyantha Blume (Soalu), the two primary host plants, is prerogative of Assam for commercial production of golden yellow Muga silk. Abstract. JJA
Larvae were given a choice between L. grandifolia and water. The weight of the tender leaves ranged from 0.03 g to 0.17 g for P. bombycina, 0.06–0.60 g for L. polyantha, 0.18–0.51 g for L. salicifolia and 0.09–0.19 for L. citrata. The host plants were maintained in the experimental field of CMER&TI and the silkworms were reared in the experimental field in outdoor conditions following standard procedures (Chakravorty et al. . C
(Neog et al. G
Caryophyllene, decyl aldehyde, dodecyl aldehyde, that showed positive response on the attraction test, also produced biting behavior by the larvae. Maximum survival and cocoon crop production in B. mori was achieved by feeding tender leaves to young larvae (1st -2nd instars), medium leaves to 3rd and 4th instars, and mature leaves to 5th instar larvae (Veda et al. Your comment will be reviewed and published at the journal's discretion. Rivet
Morin and quercetin did not produce as significant a response for muga silkworms. 1991, Lederhouse et al.
Lack of knowledge of its genetics and host plants is a major bottleneck. Blackmer
host plant of Muga silkworm (Antheraea assamensis Helfer) Neog K1*, Das A1, Unni BG2, Ahmed GU3 and Rajan RK1 1Central Muga Eri Research & Training Institute, Central Silk Board, Lahdoigarh, Jorhat, Assam;India. H
Its other host plants include Actinodaphnae obovata Nees (Blume), A. anquistifolia (1992) observed highest survival rates and first instar growth rates for P. troilus on Lindera benzoin and P. palamedes on Persea borbonia. The silkworm, Antheraea assamensis Helfer (Lepidoptera: Saturniidae), grows primarily on Persea bombycina and Litsea polyantha.To understand if the restricted diet breadth is due to the specific role of gustatory sensilla of the larvae of A. assamensis, the same fifth instar larvae retaining only labrum‐epipharynx or galeal sensilla were subjected to food choice tests. Riffel
Rearing performance of muga silkworms fed with leaves treated with selected chemicals. The ends of the two arms of the Y-tube were connected to two adaptors made of Z-glass, and in each adaptor was placed a piece of Whatman filter paper (1 cm2). Handwoven in Assam. Nees and L. citrata Blume, and the chemical basis of feeding preference were investigated. An insect approaches its host plant for feeding, oviposition, or shelter ini-tially, most likely through perception of volatile chemicals. In the present investigation, it was observed that young larvae fed with mature leaves and vice versa had the lowest survivale rates, suggesting that feeding larvae with leaves of suitable maturity is important for higher survival. Larvae were given a choice between host, P. bombycina, and non-host, L. grandifolia. The 50% food consumption in T50 time was expressed in terms of percent consumption per minute using the unitary method of mathematical calculation. Percentage of larvae opting for odor choice in Y-tube olfactometer.
1995; Agarwal 1998; Walling 2000; Schoonhoven et al. 2007; Jorgensen et al. Simpson
After each test, the entire set-up was turned 180° to avoid any positional effects. Baruah
Their survivability was recorded up to 2nd instar. 2010; 20:1–13. Lewis
This information may be useful in creating a diet that is capable of supporting the growth of the larvae up to maturity under indoor conditions.
The au-thors are also grateful to the three anonymous reviewers for their valuable comments for im-proving the quality of the work. . 40% of NONE larvae opted for P. bombycina, while 60% opted for L. grandifolia. It is a well-known fact that, for an insect with several host plants, a single plant species may not provide the most beneficial conditions during all parts of the life cycle (Reavey and Lawton 1991, Scheirs et al. Phytophagous insects show varying degrees of association with host plants, a particular plant species or group of plants on which they feed (food plant range) (Unni et al. The relative quantities of these compounds in the leaves of three different maturity levels are presented in Table 3. These tests indicated that morin and quercetin, that are reported to be factors causing biting behavior of B. mori, did not show such response for muga silkworms.
When ablated larvae were given a choice be-tween the odor of a host versus non-hosts, ALL, UNI, ANT, and MAX larvae opted for only the host plant odor (p < 0.001) and only NONE larvae opted for both the choices (p = 1.0). 1992), and a decision is made on a preconstruction recognition template, be it innate or acquired (Del Campo et al.
Nees and Litsea citrata Blume, are considered to be secondary host plants. Hazarika (1994) categorized Machilus (=Persea) bombycina idiotypes into most preferred, moderately preferred and least preferred types and suggested that dodecanal and caryophyllene, present dominantly in the most preferred idiotypes, may play the role of olfactory attractants, enhancing the feeding rate of muga silkworms on these plants. PAL activity was significantly higher in medium leaves of P. bombycina and L. polyantha compared to other leaves. 30 eggs per host larva.
Translations are not retained in our system. Its other host plants include Actinodaphnae obovata Nees (Blume), A. anquistifolia (Blume) Nees, Cinnamomum glaucescans (Nees) Drury, C. glanduliferum (Wallich) Meisner, Litsea nitida (Roxburgh) Hooker f., all of which belong to Lauraceae family.
High quality figures are available online. Choudhury et al.
1992). Therefore, all tests of significance were carried out taking UNI larvae as the control group. RNA interference mediated serine protease gene (Spbtry1) knockdown affects growth and mortality in the soybean pod borer (Lepidoptera: Olethreutidae)