blac - bree
- black alder
- black bean aphid
- black bee
- black cutworm
- black disease of bees
- black egg
- black flowered
- black fruit rot of apple
- black kerneled rice
- black leg of cabbage
- black muscardine
- black mustard
- black night shade
- black pepper
- black poplar
- black root rot of jujube
- black root rot of sweet potato
- black rot
- black rot of carrot
- black rot of vine grape
- black rust
- black shank of tobacco
- black spot of cabbage
- black spot of kidney bean
- black spot of tomato
- black stalked
- black veined white
- blackberry
- blackflow condenser
- blackhead disease
- bladder
- blade
- blade grader
- bladex
- blanching
- blank test
- blast furnace slag fertilizer
- blastocyst
- blastoderm
- blastomere
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