Genetic abnormalities

Zucchini and squash growers very occasionally observe the presence of discolorations affecting one or more on a plant leaves . Contiguous yellow to white sectors, more or less extensive, are visible on the limbus (Figures 1 and 2).

This discoloration can also affect the stem and the fruits . It results from a local malfunction of the tissues of the limbus, the synthesis of chlorophyll is more or less inhibited. Note that the development of the leaf (s) may also be disturbed, this will result in a more or less marked deformation of the blade.

This genetic anomaly must be regarded as a curiosity without consequences for the culture. In fact, in the majority of cases, a very small proportion of plants are affected. It is to be classified under physiological diseases; it should not be confused with virosis or phytotoxicity in particular. Note that it is in no way transmissible to surrounding plants.

Let us add that this non-parasitic problem can manifest itself on other selected Cucurbits, in particular when temperatures are low and on certain varieties.