Estimate the Annual Field Generations of Lepidosaphes tapleyi (Williams) Infesting Guava Trees and Predicting its Expected Peaks Using Thermal Units Accumulation under Luxor Governorate Condition, Egypt.

Bakry, Moustafa M.S.; Dahi, Hassan F.

doi:10.21608/eajbsa.2020.109407

Cited by 1 publication

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The time when average population densities of maximum larvae per 10 plants are reached can represent a peak for one generation. The sine-Wave Model was used to calculate heat units for S. frugiperda with horizontal cut-off technique (Allen, 1976) at 30ºC and a lower threshold of 10.39ºC with a mean (364.7 DD's) for generation evolution for coinciding to Dahi et al (2020). This method was used by applying a Microsoft Excel program evolved at Plant Protection Research Institute, Agricultural Research Center, Giza, Egypt.…”

Section: -Forecasting Of Peaks Of S Frugiperda Generations Using Heat...mentioning

confidence: 99%

“…The daily means of maximum and minimum temperatures, under conditions of Luxor region, were procured by www.wunderground. com .Counting on the averages of heat units needed for completion of the generation (364.7 DD's), evaluated by Dahi et al (2020), and by comparison between actual peaks (exhibited on the field) and expected peaks (estimated by the technique of Allen, 1976).…”

Section: -Forecasting Of Peaks Of S Frugiperda Generations Using Heat...mentioning

confidence: 99%

“…By using the lower threshold (10.39ºC) and the degree-days average needed to complete the generation of S. frugiperda larvae (364.7 DD's), that evaluated (Dahi et al, 2020), and by differentiation between actual peaks (that passed in the field) and prospective peaks (which estimated by applying the Sine-Wave method (Allen, 1976) by horizontal cut off technique at 30ºC and lower threshold of 10.39ºC over the two seasons of (2021 and 2022) are depicted in Table (2).…”

Section: -Predicting Of S Frugiperda Generation Peaks Using Accumulat...mentioning

confidence: 99%

“…Its larvae consume maize at various stages of development, including leaves, stalks, cobs, and tassels, and result in a decrease in the resulting yield (Bakry and Abdel-Baky, 2023). The first appearance of S. frugiperda in Egypt was 2019 on corn crop (Dahi et al, 2020 andHend et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Many authors have reported predicting the annual generation by using the heat requirements for different insect pests (Emara et. al., 1999;Ismail et al, 2005 andDahi 2020).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Prediction of the Annual Generations of The Fall Armyworm, Spodoptera frugiperda (J.E. Smith) at Maize Crop Using Accumulated Heat Units in South Egypt

Bakry

Dahi

Gamil

2023

Egyptian Academic Journal of Biological Sciences. A, Entomology

View full text Add to dashboard Cite

The fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), is among the dangerous pests infesting maize plants in Egypt. The purpose of this work was to estimate the approximate numbers, appearance date, size of the generations, and peaks of S. frugiperda on maize plants in Esna district, Luxor Governorate, South Egypt, throughout two corn seasons (2021 and 2022). As well as the prediction of their forecasted peaks using thermal units accumulation. This was done by examining the relationship between the population seasonality of S. frugiperda and the accumulated heat units expounded as degree-days (DD's). The acquired results detected that S. frugiperda had three generations per season in the field conditions at Luxor region. These generations were achieved on July, 7 th , August, 4 th and September, 1 st , during every season. These generations lasted 4, 6, and 4 weeks, respectively. The densities of these generations were 45.00, 82.88, and 55.88 larvae per 10 plants during the first season, respectively. But, during the second season, it was 43.88, 77.99, and 58.80 larvae per 10 plants, respectively. In general, the second generation was the longest and bigger in size than the other generations throughout the two seasons.There was a positive association between the cumulative number of S. frugiperda larvae per 10 plants and the accumulated heat units over the two seasons. As well, the results mentioned the occurrence of three actual peaks that took place on (June, 7 th , July, 4 th , and September, 1 st ) and four prospective peaks that took place on (July, 4 th , July, 23 rd , August, 10 th , and August, 27 th ) during the first season. However, across the second season, there were four expected peaks that occurred on (July, 5 th , July, 24 th , August, 11 th , and August, 31 st ), respectively. Additionally, by using obtainable weather data in the Luxor region, the expected peaks of larvae generations could be revealed when the accumulated thermal units attained 364.83 ± 9.36 DD's degree days.

show abstract

Section: -Forecasting Of Peaks Of S Frugiperda Generations Using Heat...mentioning

confidence: 99%

Section: -Forecasting Of Peaks Of S Frugiperda Generations Using Heat...mentioning

confidence: 99%

Section: -Predicting Of S Frugiperda Generation Peaks Using Accumulat...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Many authors have reported predicting the annual generation by using the heat requirements for different insect pests (Emara et. al., 1999;Ismail et al, 2005 andDahi 2020).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations