Category Archives: Applications

phytophthora

Avocado and Phytophthora Cinnamomi

Avocado and “Phytophthora Cinnamomi”

Phytophthora cinnamomi is a soil-born water mould that produces an infection which causes a condition in plants called root rot dieback. The plant pathogen is one of the world’s most invasive species and is present in over 70 countries around the world.

In addition to damage to native woodlands, P. cinnamomi can also infect fruit trees, nut trees and other ornamental plants. Research has shown that P. cinnamomi can infect club mosses, ferns, cycads, conifers, cord rushes, grasses, lilies and a large number of species from many dicotyledonous families. This is such a remarkable range for a plant pathogen and highlights the effectiveness of P. cinnamomi as an aggressive primary pathogen. This species has been named among the 100 of the “World’s Worst” invaders.

Impact on avocado farming

Phytophthora cinnamomi is the leading cause of damage to avocado trees, and is commonly known as “root rot” amongst avocado farmers. Since the 1940s various breeds of root-rot resistant avocados have been developed to minimize tree damage. Damaged trees generally die or become unproductive within three to five years. A 1960 study of the Fallbrook, California area correlated higher levels of avocado root rot to soils with poorer drainage and greater clay content.

Sidewinder Precision Tree Injectors holds a very good reputation throughout Avocado growers around the world. It is well known as one of the most effective methods to reduce or even eliminate Phytophthora cinnamomi!

Please refer to the flow chart on our “Injection Process” page which outlines the majority of the facts as to why the SPT Injectors reputation continues to grow!

Trunk Drenching

Trunk Drenching

Trunk Drenching

PHYTOPHTHORA CONTROL IN YOUNG AVOCADOS

Successful replanting of avocados in phytophthora infected orchards can be difficult at best and at worst up to a 100 % failure rate.

At Sidewinder we have found the following very successful when used on trees from planting stage up till their butts are large enough to inject.
DRENCHING – ONCE EVERY TWO MONTHS

Each plant drenched over whole canopy and rot zone  with 20 litres of water mixed with 50ml. of 40 % concentrate pH. 7.2 potassium phosphonate.

Solutions should be applied via a “soft” spray, wetting all leaves and trunk and the root zone.

Images below are of a hass planted in our backyard March 00, at time it had literally no roots, all were black with phytophthora and only 6 leaves, we did it as a challenge and I think we won.

29 July 2000
29 July 2000
8 February 2001
8 February 2001

Warning — Read the pesticide manufacturers label before using with this injector system. It is an offence to use product for a purpose or in a manor other than as stated on that label, unless there is in place a current 24/c permit for the purpose proposed.

UNDER NO CIRCUMSTANCE THIS OR ANY SIDEWINDER INJECTORS TO BE USED WITH UNBUFFERED PHOSPHOROUS OR PHOSPHORIC ACID PRODUCTS SUCH AS 0-60-0 AS IT COULD CAUSE SUDDEN FAILURE OF SOME INJECTOR PARTS AND PLACE THE OPERATOR AT RISK OF SERIOUS INJURY.

Where to Inject

Where to Inject

Where to Inject

Where to injectSidewinder does not recommend continual injection into the lower trunk of the tree regardless of the injection method used, due to the ongoing accumulation of damaged tissue.

When a tree is large enough it should be injected between one and two metres [green lines] above ground level, and preferably beyond the point [ blue lines] where at some future date it will be pruned, thereby removing most od the scarred tissue at that time.

NOTE
Injected phosphorates first travel up to the leaves via the active xylem, (sap wood) before moving down the roots.

Warning — Read the pesticide manufacturers label before using with this injector system. It is an offence to use product for a purpose or in a manor other than as stated on that label, unless there is in place a current 24/c permit for the purpose proposed.

UNDER NO CIRCUMSTANCE THIS OR ANY SIDEWINDER INJECTORS TO BE USED WITH UNBUFFERED PHOSPHOROUS OR PHOSPHORIC ACID PRODUCTS SUCH AS 0-60-0 AS IT COULD CAUSE SUDDEN FAILURE OF SOME INJECTOR PARTS AND PLACE THE OPERATOR AT RISK OF SERIOUS INJURY.