Abstract:
The observations and determinations carried out in monoecious hemp crops
from Central Moldavia, during 2005-2007, have shown that the injurious entomofauna was
made up of 20 species of insects, which summed up each year, on the average, 3164.14
individuals/m2. The injurious entomofauna was framed within the orders Coleoptera,
Homoptera, Heteroptera, Diptera and Lepidoptera. The order percent was of 35% for
Coleoptera, 30% for Lepidoptera, 15% for Diptera and 10% for Homoptera and Heteroptera.
Analysing the dominance of collected species, according to their spreading, 16 species
belonged to class D1- subrecedent species, two species to class D2- recedent species, one
species to class D3 – subdominant species and two species to class D5 – eudominant species.
According to the number of registered species, the rate of dominance classes was of 75% for
class D1, 10% for classes D2 and D5, 5% for class D3, and no dominant species was registered
in class D4. The hemp crops were also affected by seven pathogenic agents: Pythium de
Baryanum, Fusarium oxysporum, Xanthomonas campestris var. cannabis, Septoria cannabis,
Perenoplasmopara cannabina, Sclerotinia sclerotiorum and Botrytis infestans. The mean
frequency of the attack produced by these pathogenic agents had values between 0.63%
(Botrytis infestans) and 16.96% (Septoria cannabis).
