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necrosis (adj. necrotic)  : death of cells or tissue, usually accompanied by black or brown darkening (necrosis caused by downy mildew on a grape leaf)

necrosis (adj. necrotic) : death of cells or tissue, usually accompanied by black or brown darkening (necrosis caused by downy mildew on a grape leaf)

downy mildew   : a plant disease in which the fungus appears as a downy growth on the host surface; caused by a member of the Oomycetes (Plasmopara viticola on underside of a grape leaf)

downy mildew : a plant disease in which the fungus appears as a downy growth on the host surface; caused by a member of the Oomycetes (Plasmopara viticola on underside of a grape leaf)

powdery mildew: a white, powdery, superficial ascomycetous fungus that is an obligate parasite and generally is found only on one or a few closely related species of plants

mildew : thin coating of mycelial growth and spores on the surfaces of infected plant parts (powdery mildew on a leaf)

Downy Mildew - underside of leaf (http://blogs.cornell.edu/ccesummerinterns/2011/07/11/mildew-madness/)

Downy Mildew - underside of leaf (http://blogs.cornell.edu/ccesummerinterns/2011/07/11/mildew-madness/)

blotch :   necrotic area of tissue irregular in form (leaf blotch of grape caused by Briosia ampelophaga)

blotch : necrotic area of tissue irregular in form (leaf blotch of grape caused by Briosia ampelophaga)

russet: brownish, roughened areas resulting from cork formation (net russeting on apple caused by powdery mildew)

russet: brownish, roughened areas resulting from cork formation (net russeting on apple caused by powdery mildew)

scald: a necrotic condition in which tissue is usually bleached and has the appearance of having been exposed to high temperatures (storage scald on d'Anjou pears)

scald: a necrotic condition in which tissue is usually bleached and has the appearance of having been exposed to high temperatures (storage scald on d'Anjou pears)

Apply a baking soda spray to keep tomato plants healthy.

Baking Soda Spray for Tomatoes

Baking Soda Spray for Tomatoes. AND Tomatoes need calcium to achieve their full flavour potential, and calcium is often greatly lacking in our soils. of a dry eggshell is calcium carbonate. When planting your tomato plants crush up (to powder) about 4

needle cast (of conifers): disease symptom caused by fungi resulting in premature drop of needles (Rhabdocline needle cast on Douglas-fir).

needle cast (of conifers): disease symptom caused by fungi resulting in premature drop of needles (Rhabdocline needle cast on Douglas-fir).

mottle   : disease symptom comprising light and dark areas in an irregular pattern, usually caused by a virus; often used interchangeably with mosaic (mottling of black raspberry leaves with raspberry mosaic disease)

mottle : disease symptom comprising light and dark areas in an irregular pattern, usually caused by a virus; often used interchangeably with mosaic (mottling of black raspberry leaves with raspberry mosaic disease)

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