Titlebook: Vegetable Crop Diseases; G. R. Dixon Book 1981 G. R. Dixon 1981 crop.disease.diseases

Introduction

Pathogens of Composite Crops, is a major problem for those producing lettuce crops. This pathogen is dealt with in section 6.4.3. Powdery mildew (.) is included since it presents an excellent example of the evolution of a pathogen capable of invading the lettuce crop (.), whereas previously it was confined to wild lettuce (.).

CRASS

Pathogens of Umbelliferous Crops,cent study of parsnip canker provides an example of the elucidation of a complex disease syndrome and its partial control by plant breeding. The sections covering virus pathogens are divided on the basis of whether the principal host is carrot, celery or parsnip, but several viruses have wider host

不適

Pathogens of Monocotyledon Crops,known to be seed-borne. Control may be achieved even at the dry bulb storage stage by use of systemic fungicides applied as seed dressings. The causal agent of white tip of leek (.) is found to incite a necrotic flecking of white storage cabbage, thereby providing a rationale for some of the losses

Ostrich

食草

flimsy

G. R. Dixonecome disturbed in a different way. An example of another type of (man’s) “interference with nature’s balance of forces” is the introduction of modern technology and medicine in up till recently ?backward” countries. The ensuing raise in available food and the better hygienic standards removed the o

Osteons

Communal

obviate

冬眠