SC registers high infectivity of corn leafhoppers.

Santa Catarina registers for the third consecutive week an increase in the state average of corn leafhoppers (Dalbulus maidis), with 98 insects per trap. This increase, according to Epagri/Cepaf researcher Maria Cristina Canale, responsible for the Monitora Milho SC program, may be related to a combination of factors, such as high temperatures and management difficulties in the final stages of the production cycle. 

The survey conducted between January 12th and 19th indicates an increase in all regions of the state. Furthermore, Maria Cristina reveals that laboratory analyses demonstrate a high infectivity rate of leafhoppers, with the presence of pathogens responsible for corn stunting and viral diseases.

“Unlike what we observed in previous weeks, when the pathogens were concentrated in the West and Northern Plateau regions, we now have a more uniform distribution throughout the State, which raises an alert for producers, especially those planning to plant corn in the off-season,” he explains.

Guidelines

Given this scenario, it is recommended that producers properly adjust their machinery to avoid grain losses during harvesting. Maria Cristina also advises farmers to avoid planting new corn crops in areas too close to already mature crops.

“Insects present in the environment tend to migrate to newer plantings in search of more tender tissues to feed on. Therefore, it is essential that new areas are not located near older crops. In addition, producers should carry out management during the vegetative phase using contact and systemic insecticides, combined with biological products whenever possible,” he recommends.