Agriculture Reference
In-Depth Information
Having prolonged growing period in dry soil, in sugar beet root, mostly foreign
hybrids, because of slow growth of tissue, pachypleurous cells are formed, which
lose their plasticity. After rainfalls, the intensive growth of tissues is followed by skin
crackling and further settling with soil fungi in it. Then deformed roots that rot rapidly
are formed (Figure 20.7).
FIGURE 20.7
Deformed roots as a result of abnormal weather conditions.
Bare patches, namely brown and red root rots (Figure 20.8), are the most spread
and harmful sugar beet diseases that infl uence the quality of beet and provoking affec-
tion of many crops that lead to increasing of rhizoctonia inoculators in soil.
FIGURE 20.8
Brown and red root rots development on sugar beet.
Researches have determined that rhizoctonia development depends greatly on
weather conditions and soil humidity especially. There is a direct relation between soil
humidity and quantity of inoculators in it. Thus, increasing soil humidity by 1 percent
is followed with rise in number of rhizoctonia fungi germs (i.e., spores) as much as 10
percent and more (Figure 20.9).
 
Search WWH ::




Custom Search