Spatial distribution and enumerative sequential sampling plans of the pod borer, Heliothis viriplaca in rain-fed chickpea (Cicer arietinum L.) fields in Lorestan porovince

Chickpea pod borer, Heliothis viriplaca, is an important pest of rain-fed chickpea (Cicer arietinum L.) fields in most regions of Iran. During 2017-2018, spatial distribution and fixed precision sequential sampling plans of, H. viriplaca population were investigated in rain-fed chickpea fields in Lorestan provinces. Regarding to the fitting of data with Taylor's power law and Iwao’s patchiness, parameters of these methods were used to develop of enumerative sequential sampling plans for each region. Results showed that, Taylor's b and Iwao’s β were significantly>1, indicating that H. viriplaca populations were aggregated in Lorestan provinces. Sample size curves were calculated and compared at 10%, 15% and 25% levels of precision. Validation results of Green's and Kuno’s models showed that, to achive a precision of 0.25, which is generally accepted in IPM programs, it is necessary to take samples with an average sample number (ASN) of 58 and 66 samples for green’s and kuno’s models, respectively.