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This padlet follows the development of Malus domestica tres at University of Hohenheim, Stuttgart. Shown pictures were taken between April 19th – July 5th, 2021.

BBA (2001), Growth stages of mono-and dicotyledonous plants: BBCH Monograph, was used for BBCH stages identification.

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Principal Growth Stage 5: Inflorescence emergence

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Principal Growth Stage 5: Inflorescence emergence

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57 Pink bud stage: Flower petals elongating; sepals slightly open, petals just visible.

Date: 19/04/21

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Principal Growth Stage 5: Inflorescence emergence

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Principal Growth Stage 5: Inflorescence emergence

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59 Most flower petals forming a hollow ball

Date: 22/04/21

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62 About 20% flowers open

Date: 28/04/21

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65 Full flowering: at least 50% of flowers open, first petals falling

Date: 30/04/21

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67 Flowers fading, majority of petals fallen

Date: 08/05/21

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69 End of flowering: all petals fallen

Date: 11/05/2021

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Principal Growth Stage 7: Development of Fruit

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Principal Growth Stage 7: Development of Fruit

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71 Fruit size up to 10 mm, fruit fall after flowering

Date: 23/05/2021

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Principal Growth Stage 7: Development of Fruit

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Principal Growth Stage 7: Development of Fruit

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72 Fruit size up to 20 mm

Date: 04/06/2021

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Principal Growth Stage 7: Development of Fruit

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Principal Growth Stage 7: Development of Fruit

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74 Fruit diameter up to 40 mm, fruit erect
(T-stage: underside of fruit and stalk forming a T)

Date: 18/06/201
Fruits around 30 mm (3 cm) diameter

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Principal Growth Stage 7: Development of Fruit

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Principal Growth Stage 7: Development of Fruit

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74 Fruit diameter up to 40 mm, fruit erect
(T-stage: underside of fruit and stalk forming a T)

Date: 05/07/201
Fruits around 45 mm* (4.5 cm) diameter.
* Size is not enough for next BBCH stage

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Woolly aphid infestation - Eriosoma lanigerum [Hausmann]

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Woolly aphid infestation - Eriosoma lanigerum [Hausmann]

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Infestion with E. lanigerum was first noticed in April 30th on lower branches and continue to spread throughout the recording period.

Kelderer et al. (2016) evaluated the effect of different methods for the control of woolly apple aphid in organic apple growing.

·       Spray applications of Polithiol, an emulsifiable suspension containing 400 g/L paraffin oil (CAS N.97862-82-3) as active substance and 5-10% w/w sulphur, 1 in late autumn and 1 in early spring significantly reduced E. lanigerum infestation. One application of the product in spring was also effective to control this pest

·       A single application of slaked slime in autumn showed to be ineffective for control.

·       Intensive pruning combined with anti-hail netting increased woolly aphid infestations. Long pruning (as few cuts as possible, weak growth stimulation) showed lower infestation levels but percent infested shoot length values remained high.

·       Reduced infestation levels were found in rootstocks of Geneva G11 and G41, and M9 Pajam 2.

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Organic Fruit Tree Spray Schedules and Apple Tree Spray Guide

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Controlling scab and other fruit tree diseases

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Federal Biological Research Centre for Agriculture and Forestry (BBA) (2001). Growth stages of mono-and dicotyledonous plants: BBCH Monograph.

Kelderer, M., Lardschneider, E., & Schütz, R. (2016). Efficacy evaluation of different methods for the control of woolly apple aphid (Eriosoma lanigerum [Hausmann]) in organic apple growing. In Proceeding to the 12th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing (Vol. 32, pp. 1232-1245).