The phrase "are unfavourable for" is correct and usable in written English.
It can be used to describe conditions or situations that are not beneficial or advantageous for someone or something.
Example: "The current economic conditions are unfavourable for small businesses trying to grow."
Alternatives: "are detrimental to" or "are not conducive to".
When conditions are unfavourable for growth and multiplication, bacteria remain dormant on or inside plant tissue.
However, high injection pressure and clamping tonnage are unfavourable for hollow design.
Those clinical characteristics which are favourable, and those which are unfavourable, for the technique of orthokeratology are listed.
Control of viral diseases of potato, for example, can be accomplished by growing the seed crop in northern regions where low temperatures are unfavourable for the aphid carriers.
Four-armed star-shaped polyesters were prepared by copolycondensation of a tetraacetoxyspirobisindan. Since the bisphenol-P and the spirobisindane units are unfavourable for the crystallization, the crystallinity depends on the DP, and the solubility depends in turn on the crystallinity.
In order to remove the faceted TiC, which are unfavourable for strengthening the material, two different processing routes have been successfully tested: (i) solidification with an increased rate to reduce the composition variation of the liquid during solidification, and (ii) unidirectional solidification to separate the light TiC precipitates from the melt.
The fact that most of the peninsula is unfavourable for settled agriculture is of enormous significance.
This secondary bending phenomenon is unfavourable for the fatigue properties of a structure.
They have an inherent weakness in their small torsional stiffness, which is unfavourable for columns.
Early fall seeding of winter wheat may be unfavourable for seedling infection by wheat-bunt teliospores.
When the position of equilibrium is unfavourable, for example, the accumulation of products may cause a reversal of the reaction.
