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The management of Spodoptera litura by entomopathogenic Nucleopolyhedrosis Viruses (NPVs) is one of the eco-friendly methods. The present study was aimed to evaluate Nucleopolyhedrosis Virus (NPV) against S. litura and its potential as a bio-pesticide. The Occlusion Bodies (OBs) of S. litura nucleopolyhedrosis virus was isolated from infected larvae collected from cabbage field. Pathogenicity studies evaluated three NPV suspensions viz. SpltNPV-native, SpltNPV-commercial and SpltNPV-NIPHM against second and fourth instar larvae of S. litura recorded maximum mortality at 1×109 OBs/ml. The LC50 values of the SpltNPV-native, SpltNPV-commercial and SpltNPV-NIPHM suspensions against second instar larvae were 0.584, 0.540, 0.625 OBs/mm2, respectively, which increased to 0.696, 0.620, 0.756 OBs/mm2 against the fourth instar larvae. The LT50 at 1×109 OBs/ml was found to increase from 146.33, 137.51 and 155.88 h for SpltNPV-native, SpltNPV-commercial and SpltNPV-NIPHM suspension, respectively, against the second instar larvae to 178.51, 162.07 and 187.67 h, respectively, against the fourth instar larvae. The cumulative per cent mortality, LC50 and LT50 suggested that the second instar larvae were more susceptible and easier to kill than the fourth instar larvae.
The management of Spodoptera litura by entomopathogenic Nucleopolyhedrosis Viruses (NPVs) is one of the eco-friendly methods. The present study was aimed to evaluate Nucleopolyhedrosis Virus (NPV) against S. litura and its potential as a bio-pesticide. The Occlusion Bodies (OBs) of S. litura nucleopolyhedrosis virus was isolated from infected larvae collected from cabbage field. Pathogenicity studies evaluated three NPV suspensions viz. SpltNPV-native, SpltNPV-commercial and SpltNPV-NIPHM against second and fourth instar larvae of S. litura recorded maximum mortality at 1×109 OBs/ml. The LC50 values of the SpltNPV-native, SpltNPV-commercial and SpltNPV-NIPHM suspensions against second instar larvae were 0.584, 0.540, 0.625 OBs/mm2, respectively, which increased to 0.696, 0.620, 0.756 OBs/mm2 against the fourth instar larvae. The LT50 at 1×109 OBs/ml was found to increase from 146.33, 137.51 and 155.88 h for SpltNPV-native, SpltNPV-commercial and SpltNPV-NIPHM suspension, respectively, against the second instar larvae to 178.51, 162.07 and 187.67 h, respectively, against the fourth instar larvae. The cumulative per cent mortality, LC50 and LT50 suggested that the second instar larvae were more susceptible and easier to kill than the fourth instar larvae.
Insect immune responses involved in virus defense have lately received increasing attention. While the pathways and effector molecules active in defense against bacteria and fungi are well studied (Ferrandon et al., 2007;Levitin et al., 2008), the regulation of the innate immune system against viral infections still remains to be elucidated. The baculoviruses (Baculoviridae) are doublestranded DNA viruses that infect arthropods, mainly insects and in particular Lepidoptera (Cory and Myers, 2003). Baculoviruses are not only biocontrol agents of lepidopteran pests, but also have been developed and used extensively in research, serving as expression vectors for high-level production of recombinant proteins (Bonning and Hammock, 1996;Susurluk et al., 2013). Although baculoviruses have been successfully used to control lepidopteran and hymenopteran insect pests of agriculture and forestry importance worldwide, little is known about the host immune responses towards these viral infections (Federici, 1986;Miller, 1997; Moscardi, 1999).Transferrin is an iron-binding protein that has a role in iron transport (Nichol et al., 2002), in preventing oxidative stress, and in delivering iron to eggs for development (Yoshiga et al., 1997). In addition, it is known that transferrin synthesis is increased following exposure to bacteria, fungi, pathogens, and parasites, as well as insect parasitoids (
This study investigates the mechanism of action of DNA insecticides, a novel preparation against gypsy moth (Lymantria dispar) based on the DNA fragments of the antiapoptotic gene of its nuclear polyhedrosis virus. In our experiments gypsy moth showed significant susceptibility to applied DNA insecticides on the basis of BIR and RING domains fragments of LdMNPV IAP-3, whereas common fruit fly and tobacco hornworm did not. PCR with the same fragments of BIR and RING domains of the LdMNPV IAP-3 gene as primers revealed parts of the genomes of gypsy moth, common fruit fly, and tobacco hornworm. Part of the gypsy moth genome cloned with the fragments of BIR and RING domains of the LdMNPV IAP-3 gene as primers has an overlap with the corresponding part of the LdMNPV IAP-3 gene and Lymantria dispar IAP-1 mRNA for an inhibitor of apoptosis protein with the high cover of the latter by query, which allows assuming that we cloned a part of a gypsy moth antiapoptosis gene. This finding suggests that DNA insecticides might act through the mechanisms characteristic for blocking of posttranscriptional expression of gypsy moth antiapoptosis genes.
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