Seasonal occurrence of color variations of Harmonia axyridisas(Pallas)in Horqin district
Seasonal occurrence of color variations of Harmonia axyridis(3582 heads in total)were studied from the Horqin district,Tongliao City in 2018 and 2019.A total of 105 color variations were found,including 96 non-melanic variations and 9 melanic variations,among of them 78 new record color variations for this place.From the perspective of seasonal distribution,there were 49 color variations in summer and 87 in autumn.The types and individual number of 19-spot variation were the largest among all variations.The proportion of high spot type(16-19 spot)of non-melanic variations was significantly higher than that of low spot(0-7 spot)and medium spot(8-15 spot)in summer and autumn.The proportions of low and medium spot were significantly higher in summer,while the proportion of high spot type was significantly higher in autumn in the same type.The occurrence frequencies of each spot on elytra was higher in autumn than in summer,but the order of probability was roughly the same in summer and autumn,with the highest probability of spot 3 and the lowest probability of spot 1/2 in non-melanic variations.
万方数据
维普
