Temperature-dependent development of the citrus psyllid, Diaphorina citri (Homoptera: Psylloidea), and the predicted limit of its spread based on overwintering in the nymphal stage in temperate regions of Japan

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The citrus psyllid Diaphorina citri Kuwayama transferred huanglongbing (HLB) are distributed in the southern Islands (Yaku, 30°20′N, 130°30′E) of Japan. To predict the northern limit of the spread of the insect, I examined temperature-dependent development and determined the developmental zero of the insects in a laboratory. Eggs and nymphs were reared at temperatures of 15.0 to 32.5℃ at an interval of 2.5℃ with 16L:8D on shoots of orange jasmine, Murraya exotica L. Nymphs at 15.0℃ fail to develop to adults, and the mortality of those at 32.5℃ increased. The incubation period decreased at higher temperatures, varying 15.0 to 2.5 d. These nymphs became adults in 36.3 d at 15.0℃ and in 10.7 d at 30℃, but 16.8 d at 32.5℃. The developmental zero and effective accumulative temperatures were 13.66℃ and 46.93 d-degrees in the egg group, 11.56℃ and 192.27 d-degrees in the nymph group, respectively. Based on these results and winter temperatures, the northern limit of nymphal overwintering of the psyllid in Japan was predicted: the northern limit may be off the southern shores of Kyushu Island, southern Japan, and ca. 31°N.
2006-08-25