Een geval van noodrijpheid bij blauwmaanzaad

Summary

Premature dying of seed poppies, of unknown cause, was observed in The Netherlands, in 1959, at the end of the vegetative growth period.

In a spraying experiment with systox the untreated plants died prematurely and showed a 50% decrease in yield based mainly on the weight of harvested seed. This disorder may be due to sugar beet yellows virus or to aphid damage alone. One spray before flowering reduced the disease and increased the yield.

The fungusPyrenophora calvescens (Fr.) Sacc., which also is supposed to cause a premature ripeness of seed poppies, was present to the same degree in both the untreated and the sprayed plots.