Planta Daninha (Jun 1979)
Controle de plantas daninhas e efeitos de herbicidas na cultura de Gladiolus Weed control and effects of herbicides on Gladiolus
Abstract
O controle de plantas daninhas e a tolerância de gladíolos, cultivares Spick and Span e White Friendship, a tratamentos herbicidas foi estudado em um experimento de campo em solo areno-argiloso. Foram aplicados os herbicidas trifluralin e EPTC em pré-plantio com incorporação e chloroxuron, DCPA, diphenamid, pendimethalin e diuron em pré -emergência. Houve maior incidência de gramíneas que foram controladas por todos os herbicidas, exceto chloroxuron, sendo o controle pelo EPTC de 83% e pelos demais, acima de 90%. Para as dicotiledóneas, o controle foi na seguinte ordem decrescente: pendimethalin, chloroxuron, diuron, trifluralin, EPTC, DCPA e diphenamid. O EPTC afetou a germinação de bulbos, causando, também, retenção de crescimento e atraso no ciclo. No florescimento, as hastes florais foram colhidas, medidas e pesadas, verificando-se redução significativa de peso de matéria fresca com o tratamento EPTC para o cultivar Spick and Span, e com trifluralin, EPTC, chloroxuron e pendimetha lin para o White Friendship.The weed control by herbicides and their effects on gladioli was evaluated on a field experiment on sandy-loam soil on CV Spick and Span and White Friendship. Trifluralin and EPTC were applied pre-plant incorporated and chloroxuron, DCPA, diphenamid, pendim et halin and diuron in pre-emergence. Grass species were predominant in the area and were controled by all herbicides except chloroxuron. Control by EPTC was of 83% and over 90% by all others. The broadleaves were controled in the following decrescent order: pendimethalin, chloroxuron, diuron , trifluralin, EPTC, DCPA and diphenamid. Only EPTC affected the sprouting of bulbs, causing also growth retention and delaying of flower set. The flowers stems were cut off a the opening of the first flower, measured and weighted. EPTC caused significant reduction in weight of CV Spick and Span and trifluralin , EPTC, chloroxuron and pendimethalin of CV White Friendship.
