Strengthen plants weakened by pathogens with Avengelus BASIC

Our customer Mrs. A.I. S. from St. Gallen owns a Prunus lusitanica ‘Angustifolia’ also called Portuguese cherry laurel. This cherry laurel has a nice charisma and spreads Mediterranean charm. It comes from Portugal and its leaves, 6 to 12 centimetres long, have a beautiful shine. But the Portuguese cherry laurel has even more to offer: Its branches have a deep pink colour and the white flowers (from June to July) smell very pleasant. No wonder bees, butterflies and birds are attracted by this cherry laurel. The care is simple, because this plant is quite undemanding: cut back once a year, it grows well on any soil or in flower pots.

For two years, Mrs. S. has been observing increasingly severe damage to the leaves of her cherry laurel by the weevil. In spring 2018 there were almost no leaves left on the plant.

Detect damage caused by the weevil

As weevils are nocturnal animals, they are rarely seen. During the day they hide under mulch, leaves, flower pots. The infestation is usually only noticeable by the characteristic pattern of damage. The larvae eat the roots, while the beetles eat the green parts of the plant above ground. Typical damages are U-shaped eroded leaf edges – the so-called bayside damage.

For treatment, MycoSolutions recommended the use of nematodes spread in water and with a watering can on the soil to be treated in June 2018. The useful 0.1 mm small microorganisms penetrate the larvae and pupae of the weevil and thereby transmit a bacterium that multiplies in the larva and causes them to die. Then they look for a new host or survive in the soil.

In addition to root canal treatment with nematodes, Mrs. S. also used the plant growth promoter Avengelus BASIC Gel at the end of June 2018. Just one week after the treatment, the Portuguese cherry laurel began to sprout again. Interestingly, the newly formed leaves were not infested by the beetle of the weevil, although traces of feeding were still visible on older leaves.

Pre-immunisation against pathogens by Trichoderma

Pre-immunisation by Trichoderma

Model for pre-immunisation with Trichoderma versus Botrytis cinerea in tomato. Root colonization with Trichoderma increases the activity and formation for Jasmonic acid (JA) in leaves, which in turn increases the resistance of the leaves against pathogens (e.g. insect caused damage). Salicylic acid (SA) helps the plant to defend itself against fungi and abscisic acid (ABA) helps to cope with drought stress (Martínez-Medina et al., 2013; Harman et al., 2004).

Avengelus BASIC contains a high number of Trichoderma harzianum spores. These produce various substances in the root area of the host plant and stimulate them to produce more of their own antibodies. With this pre-immunisation, Trichoderma helps many host plants to protect themselves against pathogens and to remain vital.

Ms. S. was pleasantly surprised at how quickly her Portuguese cherry laurel responded to the treatment and will now carry out further follow-up treatments with Avengelus BASIC Gel.

Frassspuren vor der Behandlung

Typical feeding marks of the weevil on the leaves of the Portuguese cherry laurel before treatment with Avengelus F Gel (March 2018)

New sprouting of the Portuguese cherry laurel 4 weeks after treatment with Avengelus F Gel

Neuaustrieb nach der Behandlung

New sprouting of the Portuguese cherry laurel after treatment with Avengelus F Gel (July 2018)