Sugar beet (Beta vulgaris) is a strategic agricultural product in Iran, meanwhile several pests cause damage to the crop and reduce its yield. Sowing dates and planting methods might have influence on the pest population and damages. Thus, current research was carried out for studying the planting methods and date of sugar beet sowing under field conditions. The treatments were 1) sowing direct seed (SDG1 = on time-planted in April 24th, SDG2 = delay time-planted sugar beets in June 12th), 2) planting seedling (SDG3 = June 11th).
The observations for record of data were carried out at weekly intervals from germination stage or establishment of seedling up to maturity in August 27th. Results revealed that the mean injuries of pest insects especially Agrotis segetum Schiff.; Chaetocnema tibialis Illiger; Conorhynchus brevirostris Gyllenhal; Spodoptera exigua Hübner and Scorbipalpa ocellatella Boyd. were significantly different in various sowing date and methods. The incidence of these pests was relatively low during the first season than the second one. The cultivation of transplanting seedling could significantly reduce the density of the pest insects and decrease crop injury rather than others. Overall, due to the annual increasing of the temperature as global warming and thus increasing insect pests and use of pesticides; transplanting seedling could use as a non-chemical method in management of sugar beet pest insects.
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