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1 - Sensivity analysis of the effective input parameters upon the population flactuation of the sunn pest adult insect using Artificial Neural Network
Zahra Dustiy Naser Moeini naghadeh Abbas Ali Zamani Leila Naderloo

The Sunn pest, Eurygaster integriceps Put. is the most important pest of wheat and barley in Iran. Many studies have shown that various biotic and abiotic environmental factors affect the population of this pest. In this study, the relationship between population densit More

The Sunn pest, Eurygaster integriceps Put. is the most important pest of wheat and barley in Iran. Many studies have shown that various biotic and abiotic environmental factors affect the population of this pest. In this study, the relationship between population density of the Sunn pest adult insect with different environmental factors including sampling date, average daily temperature, average relative humidity, wind speed, wind direction, height from sea level and degree-day was investigated. Field data were collected from two wheat farm of one-hectare in the city of Chadegan, Isfahan province. The used network type was multilayer perceptron with back propagation algorithm and the learning algorithm was Levenberg-Markvart. After sensitivity analysis due to the ease of the model and extraction of effectiveness of factors including four factors of sampling date, temperature, humidity and wind speed were selected. The results showed that a neural network with two hidden layer, 7 neuron in the first hidden layer and three neuron in the second hidden layer, as a sigmoid activation function, and a data percentage of 60, 30, 10 for training, testing and validation for prediction of population fluctuation of the Sunn pest adult insect is used (R2= 0.94). Manuscript profile
Open Access Article
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2 - Population density of Eurygaster integriceps (Het., Scutelleridae) and spatial distribution pattern of its nymphs on irrigated wheat field in Chadegan city
Zahra Doosti Naser Moeini-Naghadeh Abbas Ali Zamani Leila Naderloo

The Sunn-pest, Eurygaster integriceps Put., is the most important insect pest of wheat and barley in Chadegan city, in Isfahan province. This study was conducted on a farm with an area of one hectare in 2015 and 2016 in Chadegan county. In this research with sampling re More

The Sunn-pest, Eurygaster integriceps Put., is the most important insect pest of wheat and barley in Chadegan city, in Isfahan province. This study was conducted on a farm with an area of one hectare in 2015 and 2016 in Chadegan county. In this research with sampling regular population fluctuation and spatial distribution nymphal stage different by using Taylor’s power law and Iwao’s patchiness regression was calculated. Based on the results of Taylor’s power law in 2015 (except 5 nymphal stage) and 2016 the spatial distribution of nymphal instars different, was determined aggregated. In Iwao’s patchiness regression, the spatial distribution of nymphal stages different in 2015, was determined aggregated and in 2016 the spatial distribution except 3 and 4 nymphal instars, was determined aggregated. Upon the results of this research, appearance date 1st to 5th nymphal instars in 2015 were observed in 10th, 16th, 16th, 19th and 26th May respectively. appearance date 1st to 5th nymphal instars in 2016 were observed in 18th, 21th, 23th, 31th May and 4th Jun respectively. Maximum density population 2nd nymphal instar that is the best time for control sunn pest was observed in 2015 and 2016, 30th may (2.43±0.65) and 4th Jun, respectively Manuscript profile

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List of Articles abbasali zamani