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Harvest Date and Sucker Control Method on Maryland Tobacco¹

Adverse weather and other factors can sometimes delay the harvest of Maryland tobacco (Nicotiana tabacum L.). A study was conducted in 1984 and 1985 to evaluate the combined effects of five sucker control methods and delayed harvest. The sucker control methods used were: (i) topped-hand suckered (THS); (ii) Royal 30 (KMH) (K salt of 1-2-dihydro-3,6-pyridazinedione-maleic hydrazide); (iii) Prime + (P+), (2-chloro-N-12,6-dinitro-4-(trifluoromethyl) phenyl]-N-ethyl-6 flurobenzenemethanamine); (iv) Bud (BN) (isopropyl N-(3 chorophenyl) carbamate); and (v) Off Shoot T-85 (OST-85) (l-decanol plus 1-octanol mixture). Harvest dates were 2, 3, 4, and 5 weeks after topping. Chemical sucker control treatments produced higher yields and value per hectare than handsuckered treatments. The OST-85 and P+ treatments were highest in yield and value at 5 weeks, apparently due to more growth of the upper leaves. Differences were noted for leaf chemical and physical properties and for effectiveness of sucker control among sucker control methods. No significant differences among harvest dates were noted for yield, value, and total N. Year x harvest date interactions occurred for burn duration and filling capacity. A significant increase in total alkaloids occurred with delayed harvest.

Key Words: Nicotiana tabacum L. • Burn duration • Filling capacity • Total alkaloids • Total-N

² Assistant professor, Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742.

Received for publication June 23, 1986.