Life cycle and infection characteristics of Heterodera elachista in rice were investigated by artificial inoculations with secondinstar juveniles in laboratory and investigation in rice field. The secondinstar juveniles were attracted nearby the meristem zone or elongation zone of rice root tips within 24 h, invaded and established feeding sites in the central cylinder of roots within 24 h at 30℃. After penetration, the juveniles developed into white females within six days and males within eight days. The gelatinous matrixes were secreted by the females from vulva within 12 days. Parts of eggs were released into the egg sac and parts of eggs were retained within the body of the brown cyst. The secondinstar juveniles were emerged from egg mass within 18 days. The development of nematode were very slow below 20℃. The shortest life cycle at 30℃ from the infective juvenile to the emergence of secondinstar juvenile is 18 days long while from egg to egg stage is 22 days. Relatively high temperatures(28~35℃) were favored to the invasion and development of H. elachista，while waterlogging reduced the rates of invasion and had no influence on the development of H. elachista.
DING Zhong1，2 , NAMPHUENG Janthathang1 , HE Xufeng1 , WU Minmin1 , HONG Hong1
. Life Cycle and Infection Characteristics of Rice Cyst Nematode, Heterodera elachista Ohshima in Rice[J]. Chinese Journal OF Rice Science, 2012
, 26(6)
: 746
-750
.
DOI: 10.3969/j.issn.10017216.2012.06.016
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