ABSTRACT
A trial was carried out, under greenhouse conditions, to assess the effect of plants with different host suitability degrees on the morphometrics of a Brazilian Heterodera glycines population Each plant of the tested hosts (soybean ‘FT-Cristalina’, common bean ‘IAC-Carioca’, pea ‘Maria’, chickpea, sunn hemp ‘IAC 1-2’, adzuki bean ‘AL-9’, mung bean ‘M-80’ and white lupin) was inoculated with 1,000 second-stage juveniles, with 20 repetitions. The juveniles, males and cysts were extracted after 45 days of the inoculations. The eggs were subsequently extracted from the cysts. The study comprised 23 characters regarding to juveniles, 19 to males, 12 to cysts and 2 to eggs. According to the results, pea, sunn hemp and chickpea were rated as very poor/unfavourable hosts not allowing to the development of nematode specimens in their roots in sufficient number to make possible a comparative study together with the other tested host plants. For common bean, adzuki bean, mung bean and white lupin, rated as moderately resistant hosts, significant differences occurred for some characters in relation to soybean data, but no evidence of negative effects of these plant species on the morphometrics of the nematode could be noticed.
KEY WORDS:
Sybean cyst nematode; morphometrical variations; Brazil.