Nabis capsiformis و شكار گرماي Creontiades pallidus تعيين برنامه نمونه برداري و الگوي توزيع فضايي سنگ قوزه پنبه

Sampling Programme and Spatial Distribution of Creontiades pallidus (Het., Miridae) and Its Predators Chrysoperla carnea (Neu., Chrysopidae)and Nabis capsiformis (Het., Nabidae)

Sampling programme and spatial distribution patterns of Creontiades pallidus Ramber and its predators Chrysoperla carnea (Stephens) and Nahis capsiformis Germar were determined in Torbat Heidarieh and Sabzevar (Khorasan province) during 2001 - 2002. Ten times netting by a sweep net was determined as a sample unit. Reliable sample sire was obtained to be 25. Variance to mean ratio and regression methods (Taylor and Iwao) were used for deteminig the spatial distribution patterns of the insects. The results revealed that spatial distribution of nymphs and adults in C. pallidus and larvae in C. cornea were aggregated. The spatial distribution of nymphs and adults in N. capsiformis was determined as random. It seems one of the important reasons for random distribution of N. capsiformis was low population density of this predator. The similarity of distribution patterns in C. pallidus and C. carnea indicated a positive reaction of predator to aggregation of its prey and such behavior may increase the efficiency in the predator. Determining the sampling programme and spatial distribution in C. pallidus can be used in integrated management of this important pest in cotton fields.