MC APPLICATIONS - DECISION BASE

Follow Fruit Retention (FR) and Height:Node Ratios (HNR) vs. Heat Units After Planting (HUAP)

• Reference: HNR & FR baselines with upper and lower thresholds, Figures 1 & 2 (J.C. Silvertooth et al. UA)

  IF HNRs are trending toward, equal, or exceed upper HNR thresholds (Fig. 1)

  • vegetative tendancies are very likely
    • evaluate fruit retention (FR) levels also, (see Figure 2)
    • should confirm vegetative condition
  • consider initiation of MC treatments
  • follow rate guidelines (see Table below)
  • follow crop response (HNRs)

  
  IF HNRs are near the baseline (middle line on figures)

  • plant height (vegetative) control is not a problem
  • withold MC applications

  
  IF HNRs are near lower HNR threshold

  • crop may have been under some degree of stress
  • evaluate crop for possible causes of reduced vegetative structure
  • withold MC applications

  
  

Continue to monitor field development on a regular basis: follow HNR and FR conditions in relation to baselines

Table 1. Suggested Mepiquat Chloride (MC) application rates*

*Based on University of Arizona research (J.C. Silvertooth, et al.)

Full Disclaimers

Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture and Life Sciences, The University of Arizona.

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