scholarly journals The influence of agricultural occupation and climate on the spatial distribution of Plusiinae (Lepidoptera: Noctuidae) on a latitudinal gradient in Brazil

2021 ◽  
Vol 65 (1) ◽  
Author(s):  
Sabrina Raisa dos Santos ◽  
Alexandre Specht ◽  
Eduardo Carneiro ◽  
Mirna Martins Casagrande
Keyword(s):  
Spatial Distribution ◽  
Latitudinal Gradient ◽  
Lepidoptera Noctuidae

Spatial distribution of Spodoptera frugiperda (Lepidoptera: Noctuidae) in maize landraces grown in Colima, Mexico

2008 ◽  
Vol 28 (03) ◽  
pp. 126 ◽  
Author(s):  
J.L. Hernández-Mendoza ◽  
E.C. López-Barbosa ◽  
E. Garza-González ◽  
N. Mayek-Pérez
Keyword(s):  
Spatial Distribution ◽  
Spodoptera Frugiperda ◽  
Maize Landraces ◽  
Lepidoptera Noctuidae

Emergence of Male-Sterile Heliothis virescens (Lepidoptera: Noctuidae) Backcross Moths at a Central Release Point and Their Resulting Spatial Distribution

1993 ◽  
Vol 28 (3) ◽  
pp. 241-248
Author(s):  
M. L. Laster ◽  
D. D. Hardee ◽  
J. L. Roberson
Keyword(s):  
Spatial Distribution ◽  
Heliothis Virescens ◽  
Wide Area ◽  
Pheromone Traps ◽  
Egg Viability ◽  
Male Sterile ◽  
Release Point ◽  
Lepidoptera Noctuidae

Heliothis virescens backcross moths are most effectively released in wide-area release programs from pupae placed in the field prior to moth emergence. A significantly greater moth emergence was obtained in the field from unharvested pupae in rearing trays than was obtained from harvested pupae. Mating, oviposition, and egg viability of emerged female moths were not adversely affected by handling procedures. Moths released from emergence containers were recovered in the most distant trap, 5.5 km, from the release point. However, the greatest number of released moths was captured in pheromone traps within 1.7 km of the release point.

Diurnal Abundance and Spatial Distribution of Armyworm, (Lepidoptera: Noctuidae) in No-till Corn

1991 ◽  
Vol 26 (2) ◽  
pp. 261-266
Author(s):  
Curtis A. Laub ◽  
John M. Luna
Keyword(s):  
Spatial Distribution ◽  
Early Growth ◽  
Growth Stages ◽  
Pseudaletia Unipuncta ◽  
No Till ◽  
Sampling Program ◽  
Corn Plants ◽  
Lepidoptera Noctuidae

Armyworm, Pseudaletia unipuncta (Haworth), spatial and diurnal abundance in no-till corn was sampled at six-h intervals (at 0200,0800, 1400, and 2000) during three 24 h periods. During the early growth stages of corn, armyworm density on corn plants was higher during nighttime, and differed significantly between 0200 and 1400 hours. The number of armyworm feeding on leaf edges of the early growth stages of corn was significantly higher at 0200 than during any other time, and the proportion of total larvae on corn plants that were on leaf edges was significantly higher at 0200 than during the daytime. Daytime foliage sampling will underestimate the true populations of armyworm feeding on foliage by 1.8 to 31 fold, depending on the time and thoroughness of the sampling program.

scholarly journals SPATIAL DISTRIBUTION OF Chrysodeixis includens EGGS (WALKER, 1858) (LEPIDOPTERA: NOCTUIDAE) IN SOYBEAN CROP

2019 ◽  
Vol 17 (2) ◽  
pp. 51 ◽  
Author(s):  
Leandro Aparecido De Souza ◽  
José Carlos Barbosa ◽  
João Henrique Silva Carvalho ◽  
Leticia Serpa dos Santos ◽  
Diego Felisbino Fraga ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Negative Binomial Distribution ◽  
Binomial Distribution ◽  
Probabilistic Models ◽  
Negative Binomial ◽  
Binomial Distributions ◽  
Egg Distribution ◽  
Morisita Index ◽  
Lepidoptera Noctuidae ◽  
Chrysodeixis Includens

Among pest insects that attack soybean crops, Chrysodeixis includens (Walker, 1858) (Lepidoptera: Noctuidae) looper caterpillar deserves attention due to its key pest status in soybean crops. The spatial distribution of C. includens eggs should be investigated in order to understand the behavior of this species in the area. The aim of this study was to investigate the spatial distribution of C. includens eggs in soybean crops. The experiment was conducted with SYN 9070 RR soybean variety in an experimental area of the Teaching, Research and Extension Farm (FEPE) of FCAV/ UNESP, Jaboticabal, SP, Brazil. The area of 0.6 ha was divided into 60 equidistant plots of 100 m² each. For the study of the spatial distribution of P. includens eggs in the area, the following dispersion indexes were used: variance / mean ratio (I), Morisita index (Id), Green coefficient (Cx), k exponent of the negative binomial distribution for each sampling. Regarding the probabilistic models that describe the spatial distribution of a given variable, the data adjustment to the Poisson and negative binomial distributions was tested. According to values obtained for dispersion indexes, egg distribution occurred in an aggregate way, and the negative binomial distribution was the most appropriate probabilistic model to represent the distribution of C. includens eggs in the study area.

scholarly journals Latitudinal gradient and interannual variation of PM<sub>10</sub> concentration over eighty-six Chinese cities

2009 ◽  
Vol 9 (6) ◽  
pp. 23141-23185 ◽  
Author(s):  
W. J. Qu ◽  
R. Arimoto ◽  
X. Y. Zhang ◽  
Y. Q. Wang ◽  
L. F. Sheng ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Latitudinal Gradient ◽  
Eastern China ◽  
Pollution Index ◽  
Northern China ◽  
Pm10 Concentration ◽  
Middle Zone ◽  
Chinese Cities ◽  
Southern Zone ◽  
Northern Cities

Abstract. The spatial distribution of the aerosols over 86 major Chinese cities was constructed from 137 845 daily averaged PM10 (particles with diameter ≤10 μm) concentrations calculated from air pollution index (API) records spanning from summer 2000 to winter 2006. This dataset was based on days when PM10 was categorized as the principal pollutant, accounting for 91.6% of the total recorded days. The 83 cities in mid-eastern China (longitude 100° E to 130° E) were separated into three latitudinal zones with the Qinlin Mountain – the Huaihe River and the Yunnan-Guizhou Plateau – the Jiangnan Hill – the Wuyi Mountain as the boundaries. The spatial distribution of PM10 was complicated; the high-value spots in northern China (concentration ranged from 127.1 to 192.1 μg m−3) included Urumchi, Lanzhou-Xining, Weinan-Xi'an, Taiyuan-Datong-Yangquan-Changzhi, Pingdingshan-Kaifeng, Beijing-Tianjin-Shijiazhuang, Jinan, and Shenyang-Anshan-Fushun; in the middle zone, the high PM10 spots (concentration within 119.1–146.6 μg m−3) were Chongqing-Chengdu-Luzhou, Changsha-Wuhan, and Nanjing-Hangzhou; while in the southern zone, four cities (Qujing, Guiyang, Guangzhou and Shaoguan) showed higher PM10 concentration (>80 μg m−3). An overall latitudinal gradient was distinct; the median PM10 concentrations decreased from 108 μg m−3 for the 38 northern cities to 95 μg m−3 and 55 μg m−3 for the middle (26 cities) and southern (19 cities) zones, respectively. Linear regression between PM10 concentration and latitude of the cities also confirmed this gradient. PM10 concentration and the APIs exhibited similar seasonality with wintertime maxima and summertime minima, and the second highest values in spring. PM10 level showed a decreasing trend (−23.2 μg m−3) for the northern cities during 2000 to 2006. For the other two zones, the PM10 levels fluctuated, but showed unobvious change (−1.7 μg m−3) for the middle zone and increased slightly (+6.2 μg m−3) for the southern zone during the course.

scholarly journals Spatial distribution pattern, bionomic, and demographic parameters of a new invasive species of armyworm Spodoptera frugiperda (Lepidoptera; Noctuidae) in maize of South Sumatra, Indonesia

2020 ◽  
Vol 21 (8) ◽  
Author(s):  
Rudi Tomson Hutasoit ◽  
Septian Hary Kalqutny ◽  
I Nyoman Widiarta
Keyword(s):  
Invasive Species ◽  
Spatial Distribution ◽  
Distribution Pattern ◽  
Spodoptera Frugiperda ◽  
Sampling Plan ◽  
Spatial Distribution Pattern ◽  
Intrinsic Rate Of Increase ◽  
Demographic Parameters ◽  
Food Crops ◽  
Lepidoptera Noctuidae

Abstract. Hutasoit RT, Kalqutny SH, Widiarta IN. 2020. Spatial distribution pattern, bionomic, and demographic parameters of a new invasive species of armyworm Spodoptera frugiperda (Lepidoptera; Noctuidae) in maize of South Sumatra, Indonesia. Biodiversitas 21: 3576-3582. The fall armyworm, Spodoptera frugiperda, has reportedly been found in Indonesia since 2019. The main hosts of this new invading insect are food crops and several other crops. This study aimed to examine the spatial distribution pattern, bionomic, and demographic parameters for developing a sampling plan and strategy to control the pest. The study was conducted by observing the total population of S. frugiperda on nine plots of maize plants weekly. The development of S. frugiperda from egg to adult was also observed in plastic containers (diameter of 4 cm x height of 8 cm) fed with maize in controlled room conditions (temperature = 29 ± 2.1°C, 74 ± 10.1% RH). Observations were made on several bionomic and demographic parameters. The results of the study showed that the S. frugiperda distributes in groups, and each group spreads with a low grouping rate. The life cycle of S. frugiperda occurs for an average of 25.11 days with a range of 24-26 days. The net reproduction rate (Ro) of S. frugiperda was 422.46 individuals/parent/generation. S. frugiperda‘s intrinsic rate of increase was 0.22 individuals/parent/day. The length of generation (T) and S. frugiperda doubling time (DT) were 26.59 and 3.04 days, respectively. This species has survived well on the maize in the new habitat, so it will threaten the food crops, especially the maize. A sampling plan can be developed based on spatial distribution parameters to monitor population density to implement a control threshold and control measures from the early stage of maize during adult pre-emergence.

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