Field efficacy of the nucleopolyhedrovirus of Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae): effect of formulations, water pH, volume and time of application, and type of spray nozzle

Silva, Mauro Tadeu Braga; Moscardi, F.

doi:10.1590/s1519-566x2002000100011

Cited by 16 publications

(9 citation statements)

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“…Por exemplo, a mortalidade de Malacosoma neustria (Linnaeus, 1758) (Lepidoptera: Lasiocampidae) por NPVMn pode ser reduzida em até 50% após uma chuva de 20mm em 10 minutos e chegar a uma efi ciência de apenas 10% após uma chuva de intensidade de 300mm em 30 minutos (JANKEVICA et al, 1998). As razões para esses resultados divergentes são ainda desconhecidas e precisam ser mais bem estudados em trabalhos futuros, porém, dentre algumas hipóteses que podem explicar essas diferenças, estão o pH da água, horário de aplicação do produto, volume de calda utilizado que precisam ser avaliados (SILVA & MOSCARDI, 2002), além das diferenças específi cas de cada vírus ou hospedeiro avaliado. Adicionalmente, também se deve considerar o tamanho da gota e da energia cinética da chuva, além da estrutura do dossel das culturas estudadas (AYLOR, 1990;MADDEM, 1997;ERPUL et al, 2004;LEGUÉDOIS et al, 2005).…”

Section: Resultsunclassified

Persistência do baculovírus anticarsia após diferentes regimes pluviométricos

et al. 2014

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Section: Resultsunclassified

Persistência do baculovírus anticarsia após diferentes regimes pluviométricos

et al. 2014

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“…To offset this detrimental effect of UV radiation, an optical brightener might be added into the viral formulation as suggested by Shapiro and Argauer (1995) provided the cost of application is economically feasible (Monobrullah and Nagata, 2001). Changing the time of application at night or evening might be another option to consider (Silva and Moscardi, 2002). Timing of virus application in the field is also important to guarantee adequate control of the insect pest.…”

Section: Discussionmentioning

confidence: 99%

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

Sajap

Bakir

Kadir

et al. 2007

JTI

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The effects of pH, sunlight and rearing temperature on infectivity of nucleopolyhedrovirus (SpltNPV) were investigated against larvae of Spodoptera litura (Fabricius). The infectivity of virus increased with increased larval rearing temperature. The LT 50 values were significantly reduced from 24 to 6 days when rearing temperature was increased from 20 to 35 8C. The pH of the substrate significantly affected the infectivity of the virus. The LT 50 values increased to about fourfold when the pH of suspension was raised from 7 to 11. Infectivity of the virus was more adversely affected in alkaline than in acidic suspension. Sunlight also deleteriously affected infectivity of the virus. The LT 50 values increased with the increase in the period of sunlight exposure. A complete viral inactivation occurred after 12 h of direct sunlight exposure.

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“…Temperature is another factor that can also affect the success of applied viruses by increasing the lethal time in regions with low mean temperatures, and by inhibiting the infection at low or high temperatures (Moscardi et al, 2011). Hence, timing of applications associated with an appropriate host age structure and density is a key feature for successful use of baculoviruses (Silva and Moscardi, 2002).…”

Section: Redução Da Eficiência Do Nucleopoliedrovirus Contra Chrysodementioning

confidence: 99%

“…The UV acts directly on the nucleic acids causing alterations or destroying them (Grzywacz, 2016), being necessary the reapplication of virus in the field at 7-10 days interval (Jeyarani et al, 2013). In this scenario, it is important that virus be applied at sundown to reduce the effects of UV radiation on the activity of them, ensuring its efficiency during the first night after application on the crop (Silva and Moscardi, 2002). The time of application used in this study may have been responsible for the fast effectiveness reduction of ChinNPV (I-A) in control C. includens larvae.…”

Section: Treatmentsmentioning

confidence: 99%

EFFECTIVENESS REDUCTION OF NUCLEOPOLYHEDROVIRUS AGAINST Chrysodeixis includens DAYS AFTER APPLICATION IN SOYBEAN PLANTS

Botelho¹,

Silva

Ávila

2018

Rev. Agric. Neotrop.

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The use of nucleopolyhedroviruses (NPVs) can provide an effective and environmentally benign alternative to synthetic chemicals. The efficacy and persistence of their occlusion bodies may be affected by several factors. The present study investigated the efficacy of isolate Chin-IA (I-A) (ChinSNPV) on third-instar Chrysodeixis includens larvae after 10 days of its application in soybean plants under semi-field conditions. Two concentrations of virus (2x10 11 and 10x10 11 PIB ha-1) and water (control treatment) were applied in soybean plants. Leaves were collected 0, 2, 4, 6, 8 and 10 days after application of treatments, and then used as disc format to feed the soybean looper larvae in the lab. It was considered a split plot scheme with a randomized complete block design (three treatments and eight repetitions) and the mortality data adjusted to a regression equation using the exponential decay model. In the day of application, the lowest and highest virus concentration caused 87.5 and 100% of mortality of larvae, respectively. However, their efficiency was reduced, on average, 70% after four days of the application. Among the factors may have compromised the persistence and activity of the isolate studied, the time after its application and ultraviolet radiation may have had a strong influence on this results. Its notable the potential use of ChinSNPV in programs for the management of this pest in soybean. Similarly, the properly application of this virus at sundown will ensure its efficiency for an extended period.

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Field efficacy of the nucleopolyhedrovirus of Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae): effect of formulations, water pH, volume and time of application, and type of spray nozzle

Cited by 16 publications

References 16 publications

Persistência do baculovírus anticarsia após diferentes regimes pluviométricos

Persistência do baculovírus anticarsia após diferentes regimes pluviométricos

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

EFFECTIVENESS REDUCTION OF NUCLEOPOLYHEDROVIRUS AGAINST Chrysodeixis includens DAYS AFTER APPLICATION IN SOYBEAN PLANTS

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