Abstract
ABSTRACT The aim of this study was to report the occurrence of Xanthopastis timais (Cramer, 1780) (Lepidoptera: Noctuidae) in amaryllis (Hippeastrum hybridum Hort., Amaryllidaceae), as well as estimating lethal concentrations (LC50 and LC99) of soursop seed extract, Annona muricata L. (Annonaceae), against its larvae. The experiment was carried out at the Laboratory of Entomology of the Research Center for Agricultural Sciences, Federal University of Alagoas, in Rio Largo-AL, Brazil. First, we collected caterpillars from amaryllis plants that were reared until pupal and adult stages (parental generation). Next, part of the adults was used for species identification, and the rest were bred to produce next generation (F1), being after that applied in a laboratory bioassay. The lab trial was performed in a completely randomized design, with six treatments and five replications containing three second-instar caterpillars. These larvae were fed pieces of amaryllis leaf (4 x 4 cm), which were previously soaked in treatments for 30 seconds and, air -dried on absorbent papers for one hour. Each treatment consisted of one concentration of ethanol extract of soursop seeds (0.0, 1.0, 0.5, 0.25, 0.125 and 0.0625% w/ v) with distilled water and DMSO at 1% (v/ v), for solutions. We noted that the lethal concentrations LC50 and LC99 were 0.29% (w/ v) and 2.27% (w/ v), respectively. In view of our results, we can state that larval stage of X. timais were influenced by extract application in terms of survival, mortality, larvae weight and larval stage length. Besides of that, it was the first time this species was recorded in Alagoas state.
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Claims 5
Claim · model-written summary
Xanthopastis timais was recorded on amaryllis for the first time, and this was also the first record of the species in Alagoas state.
AmaryllisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“FIRST RECORD OF Xanthopastis timais IN AMARYLLIS”
e1“it was the first time this species was recorded in Alagoas state”
Claim · model-written summary
The LC50 of soursop seed ethanol extract against X. timais larvae was 0.29% (w/v).
Verbatim
t0“Xanthopastis timais”
e1“the lethal concentrations LC50 and LC99 were 0.29% (w/ v) and 2.27% (w/ v), respectively”
Claim · model-written summary
The LC99 of soursop seed ethanol extract against X. timais larvae was 2.27% (w/v).
Verbatim
t0“Xanthopastis timais”
e1“the lethal concentrations LC50 and LC99 were 0.29% (w/ v) and 2.27% (w/ v), respectively”
Claim · model-written summary
Extract application influenced survival and mortality of X. timais larvae.
Not reportedComparatorDirection
Verbatim
e1“larval stage of X. timais were influenced by extract application in terms of survival, mortality, larvae weight and larval stage length”
Claim · model-written summary
Extract application influenced larval weight and larval stage length of X. timais.
- Taxon
- X. timaise1
- Treatment
- extract applicatione1
- Interactor
- X. timaise1pest
- Outcome
- larvae weight and larval stage lengthe1
Not reportedComparatorDirection
Verbatim
e1“larval stage of X. timais were influenced by extract application in terms of survival, mortality, larvae weight and larval stage length”