Introduction to the new cotton variety Demian 800 F1

Breeding unit: Demian 800 F1 is a new high-yield, high-quality, multi-resistant hybrid cotton variety developed exclusively by Denong Zhengcheng Seed Industry Co., Ltd. It passed approval in Anhui Province in 2005.

Characteristics: The variety has a whole growth period of about 134 days and belongs to the medium-maturity category; the plant is tower-shaped, with strong vigor, strong boll setting, large bolls, thin boll shells, easy boll opening, easy picking, and relatively good cotton fiber quality, with a lint percentage of 42.1%. It is highly resistant to cotton bollworm and pink bollworm; highly resistant to Fusarium wilt and tolerant to Verticillium wilt, sets three types of bolls together, resists high temperature and drought, and does not senesce early, with strong stress resistance; the pre-frost boll rate is 86.5%. It has good high-yield and stable-yield performance. From 2003 to 2004, it participated in the Anhui Provincial cotton variety regional trial, and its average seed cotton and lint cotton yields increased by 20.35% and 20.1% respectively compared with the control Wanza 40 F1, both ranking first.

Cultivation techniques: Raise seedlings in nutritive bowls, sow in mid-April when the temperature stabilizes at 15°C, and transplant in mid-May. The density per mu is 1,600-1,800 plants, and attention should be paid to widening row spacing and hilling up soil. Apply more organic fertilizer and increase phosphate and potassium fertilizer. Rational chemical regulation: use mepiquat chloride for multiple chemical regulations at the full bud stage, full flowering stage, and about 10 days after topping respectively, and pay attention to the principle of light application first and heavy application later to shape a medium-strong plant type.

Pest and disease control: Pay attention to controlling pests such as cotton aphids, red spiders, and tobacco cutworms.

Precautions: The progeny of this variety cannot be retained for seed use. Seed coating composition: 16% thiram. Coated seeds and young seedlings are toxic, so safety should be observed.