Brassica rapa (chinensis group)
~12,500 seeds/oz. 1 g packet sows 18 ft; 1⁄16 oz packet sows 30 ft. Also known as Bok Choy or Pac Choi. Pac Choy is a good crop for microgreens.
- ALTS: Alternaria Leaf Spot
- BSR: Bacterial Soft Rot
- DM: Downy Mildew
Major pests: Cabbage Looper, Diamondback Moth, Imported Cabbageworm
Cultural controls: control cabbage-family weeds near crop fields, till under crop debris of early-season brassicas after harvest.
Materials: Spinosad, Bt.
Pest: Flea Beetle
Cultural controls: floating row covers, mulch with straw, time plantings for fall harvested crops only, crop rotation, perimeter trap cropping.
Materials: Spinosad, Pyganic, Mycotrol ESO.
Pest: Cabbage Root Maggot
Cultural controls: time planting to avoid first hatching, use row covers, control weeds.
Major diseases: Black Rot, Alternaria Leaf Spot, Blackleg, Club Root, Downy Milldew, White Mold
Cultural controls: avoid transplanting plants with yellow leaves or v-shaped lesions, crop rotation, destroy crop debris after harvest, avoid overhead irrigation, control weeds, allow for good air movement.
Materials: Actinovate, copper compounds may help for some of these diseases.
Note: We cannot ship packets greater than ½ oz. (14 grams) of Brassica greens into the Willamette Valley. The State of Oregon prohibits shipping any commercial quantity of untreated Brassica, Raphanus or Sinapis because of a quarantine to control Blackleg.