highly significantP < 0.001
The effects of treatment were highly significant on the number of pear psylla eggs (χ 2 = 15.3, P < 0.001; Fig. 2B ) but not on the number of pear psylla nymphs (χ 2 = 2.61, P = 0.27) or adults (χ 2 = 1.30, P = 0.52) ( Figs 2C and D ).