Research on the sensitivity of maize varieties to Sitophilus zeamais M.

摘要

This paper reports on two years of research into the Sitophilus zeamais M. sensitivity of 25 maize varieties, among them 20 hybrids. Some obtained results are as follow: 1. 72 hours after placing samples of maize and S. zeamais (imago) 50 cm apart, the frequency of appearance of X zeamais was highest in variety B9681 (19.1%), followed by NEP.HN (Zea mays var. ceratina) (17.6%) and LVN10 (14.4%); it was lower in 4728 (5.3%). Pll (3.4%), and 3024 (2.4%). Green pea was used as the control sample (1%). 2. The preference of S. zeamais for different maize varieties clearly varied over the period of 60 days. In all of four experiments, two maize varieties --B9681 and NEP.HN -- were damaged by S. zeamais to the highest extent possible (100%); two varieties -- 3024 and LVN28 -- were damaged to a lesser extent (60-70%). After a period of 60 days the weight decreases of these samples were different. The highest weight decrease was found in two varieties-NEP.HN (31.3%) and B9681 (20.4%); a lower weight decrease was measured in 3024 (1.6%) and LVN28 (1.3%). After a period of 90 days, almost all the varieties of maize were damaged to a high degree: 7 varieties to 100%, 11 varieties to 91-99%, and 4 varieties to 80-90%, with LVN28 having the lowest level of damage (80%). 3. After a period of 60 days, numbers of S. zeamais (amigo) increased in three maize varieties --NEP.HN, LVN20, and B9681 (345 times the initial number) and fell in three varieties -- 3024, LVN31, and 4728 (0.54).7 times).