Research and Innovation

Samer and Cytro

Effect of Fungicide Application for the Control of Apple Scab (Venturia inaequalis Cke. Wint.) in ‘Gala’ Apples

Evaluation of the effectiveness of the adjuvants Cytro and Samer in enhancing fungicide performance for the control of apple scab (Venturia inaequalis Cke. Wint.) in ‘Gala’ apples in São Joaquim, SC, during the 2015/16 season.

Table 7. Effect of Fungicide Applications on Apple Scab Control and their Effects on Russeting and Average Fruit Weight in ‘Gala’ Apples. Santa Isabel Experimental Field, São Joaquim, Santa Catarina, 2015/16 Season.

  1. Fungicides were applied on: 10/03, 10/10, 10/17, and 10/24/2015.
  2. Inc. = Incidence of apple scab on fruits (10/31/2015).
  3. CI = Apple scab control index (%).
  4. Average fruit weight (g) at thinning (10/31/2015).
  5. Means followed by the same letter in the columns do not differ from each other by Duncan’s test (P = 0.05).
  6. Standard fungicide.

Chart: Treatment efficiency demonstration in apple trees.

Conclusions:

  1. The addition of the adjuvants Cytro and Samer (30 mL + 10 mL/100 L) significantly improves the performance of the fungicide Mancozeb 800 (200 g/100 L) in controlling apple scab on apple fruits.
  2. The adjuvants Cytro and Samer, applied in mixture with the fungicides Mancozeb 800 and Score, are very safe, as they do not increase the severity of russeting nor are they toxic to plants of the Gala cultivar.