А еще на следы клещика похоже.

Только что поняла: а зиги тоже листопадные тогда получаются?

Меня как бААААльшую любительницу гибискусов эта проблема очень-очень волнует Расскажите, плиз, про профилактику поподробнее? Хотя, если он появился, избавиться от него полностью не получится?

ВотЪ

Abstract: We explore the possible role of elastic mismatch between epidermis and mesophyll as a driving force for the development of leaf venation. The current prevalent 'canalization' hypothesis for the formation of veins claims that the transport of the hormone auxin out of the leaves triggers cell differentiation to form veins. Although there is evidence that auxin plays a fundamental role in vein formation, the simple canalization mechanism may not be enough to explain some features observed in the vascular system of leaves, in particular, the abundance of vein loops. We present a model based on the existence of mechanical instabilities that leads very naturally to hierarchical patterns with a large number of closed loops. When applied to the structure of high order veins, the numerical results show the same qualitative features as actual venation patterns and, furthermore, have the same statistical properties. We argue that the agreement between actual and simulated patterns provides strong evidence for the role of mechanical effects on venation development.

Comments: 10 figures, published in PLoS Computational Biology
Subjects: Biological Physics (physics.bio-ph); Computational Physics (physics.comp-ph)
DOI: 10.1371/journal.pcbi.1000055
Cite as: arXiv:0705.0902v2 [physics.bio-ph]
Submission history
From: Maria Fabiana Laguna

Создалось впечатление, что им часто чтрадают цитрусовые:
Mesophyll collapse это не патогенное заболевание цитрусовых с неизвестными причинами. Повредил листья обоих апельсинов и грейпфрута (видимо, они имеются в наличии у автора данного абзаца). The disorder begins as translucent, irregular areas of different sizes scattered throughout the leaf blade. One or more light green spots may appear, later turning brown as cells within the tissue die. Only the soft tissue inside the leaf between the veins (mesophyll) collapses at first, giving these areas the translucent appearance. Palisade and epidermal tissues are unaffected initially but may die later.

Symptoms appear readily following periods of low soil moisture and hot dry winds. For this reason, water deficiency is often thought to cause mesophyll collapse, but mite feeding, damaged root systems and excessive transpiration also are associated with mesophyll collapse. Nutritional imbalances also are implicated in mesophyll collapse of citrus.