Effect of pH, rearing temperature and sunlight on infectivity of Malaysian isolate of nucleopolyhedrovirus to larvae of Spodoptera litura (Lepidoptera: Noctuidae)

Sajap, Ahmad Said; Bakir, Mohammad Abdul; Kadir, Hussan Abdul; Samad, Norani Abdul

doi:10.1017/s1742758407824404

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…In highly alkaline conditions, the PE may be degraded and consequently reduce the infectivity of the virus. The LT 50 values of S. litura larvae treated with SpltNPV increased to about four folds when pH of the viral suspension was raised from seven to eleven days (Sajap et al, 2007). In a natural condition, the pH in the larval gut system, varying between 10 and 11, catalyses the rupturing of the PE, thereby releasing the virions (Harrap, 1972) and subsequently initiating infections in the host cells.…”

Section: Discussionmentioning

confidence: 99%

Stability of Spodoptera litura nucleopolyhedrovirus in sodium dodecyl sulphate

Nazli-Huda¹

2012

Afr. J. Biotechnol.

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Sodium dodecyl sulfate (SDS) is a foaming agent used to extract occlusion bodies (OBs) of baculoviruses from infected cells or tissues of an insect. However, these OBs may be damaged by SDS at certain concentrations. In this study, the impact of different concentrations of SDS on OBs of Spodoptera litura nucleopolyhedrovirus (SpltNPV) was determined. Even though the number of OBs harvested increased with the increase in the concentration of SDS used in the extraction, the percentage of damaged OBs also increased correspondingly as detected through scanning electron microscope (SEM) photomicrographs. The result also indicates that infectivity of SpltNPV on second instars of S. litura larvae reduced significantly with an increase of SDS concentration used in the treatment. Among the four concentrations of SDS tested, SDS at 0.1% was able to release more quality virus. Thus, SDS of less than 0.1% is recommended for obtaining optimum number of quality OBs.

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Section: Discussionmentioning

confidence: 99%

Stability of Spodoptera litura nucleopolyhedrovirus in sodium dodecyl sulphate

Nazli-Huda¹

2012

Afr. J. Biotechnol.

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“…The common cutworm, Spodoptera litura (F.) (Lepidoptera: Noctuidae), is one of the most economically important pests in many countries, including China, 31 Japan, 32 and central Asia, 33 because as a generalist herbivore, it damages various crops. Various meteorological factors can have a major effect on the development of S. litura , and the effects of temperature, humidity, and air current on its activity have been studied in detail 34–36 . However, few studies have analyzed the particular situations and periods in which specific meteorological factors are related to future abundances of S. litura , considering autocorrelations from past occurrences.…”

Section: Introductionmentioning

confidence: 99%

“…Various meteorological factors can have a major effect on the development of S. litura, and the effects of temperature, humidity, and air current on its activity have been studied in detail. [34][35][36] However, few studies have analyzed the particular situations and periods in which specific meteorological factors are related to future abundances of S. litura, considering autocorrelations from past occurrences. As such, the factors contributing to S. litura occurrence remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Time‐series analysis of population dynamics of the common cutworm, Spodoptera litura (Lepidoptera: Noctuidae), using an ARIMAX model

Kawakita

Takahashi

2022

Pest Management Science

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BACKGROUND Developing a model that adequately explains pest population dynamics based on weather‐related parameters is fundamentally important for proper pest management. Autocorrelation with past occurrences should be considered when modeling the relationship between the time series of pest occurrence data and meteorological factors; however, few attempts have been made to model these factors simultaneously. In this study, we constructed an autoregressive integrated moving average with exogenous variables (ARIMAX) model to represent the occurrence of the common cutworm, Spodoptera litura (F.) (Lepidoptera: Noctuidae), a major moth pest species in Asia, using the trap catch data of S. litura recorded approximately every 5 days. The multiple meteorological measurements taken over several past periods before S. litura occurrence were included as explanatory variables to evaluate their lag effects on future occurrences. RESULTS It was suggested that temperature had the most important effect on S. litura occurrences among other meteorological factors (i.e., humidity, wind speed, and precipitation). Especially, higher temperatures during the larval/egg stage seemed to presage a higher moth abundance. When the model was fitted using independent data that were not used for calibrating the model, the model was able to capture trends in increases in the scale of occurrence, particularly after July, when the occurrence rapidly increased. CONCLUSION Past temperature condition, particularly during the larval and egg states, is suggested to be highly important for predicting future S. litura occurrences. The ARIMAX model proposed here will allow preventive measures to be taken, effectively safeguarding food resources against pest outbreaks. © 2022 Society of Chemical Industry.

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“…A number of materials tested for use as adjuvants to protect the baculoviruses from sunlight inactivation, enhance activation over the foliage and effective intake by lepidopteran larvae (Sajap et al, 2007). Tinopal, sugars such as sucrose, fructose and sorbitol have been proved to increase the efficacy of NPV formulation (Sajap et al, 2009).…”

Section: Introductionmentioning

confidence: 99%