A characteristic feature of the ontogenesis of higher plants is the great dependence of their phenotypic structure and functions on environmental conditions at such stages of organogenesis as differentiation of the growth cone, the beginning of flower formation, preparation for game-togenesis, and the formation of male and female gametophytes[1]. In maize under moisture deficiency, the duration of the period between the end of cell division and the cessation of cell growth of styles increases significantly, which leads to a lag in the development of stigmas. High temperature and low air humidity reduce the viability of pollen and negatively affect the pollination and grain content of cobs [2]. Toxigenic fungi can infest maize at different stages of ontogenesis and use pollen as na-tural vector to enter ears during silk emergence [3, 4]. Due to the quantitative nature of maize resistance to accumulation of the most hazardous micotoxins and its significant dependence on external factors, breeding resistant genotypes proves to be an intricate task. No data regarding R genes associated with resistance to toxigenic Fusarium spp. and Aspergillus spp. is published. Therefore, field trials to assess maize susceptibility to major fungal pathogens associated with mycotoxin contamination remains the most adequate strategy to fetch out the most perspective genotypes. Current study focuses on assessing the resistance to drought and susceptibility to fungi of certain maize genotypes at the generative stages of ontogenesis.