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Alien Invader Plants
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Botanical name: Psidium guajava
Myrtle family (Myrtaceae)
English: Guava
Afrikaans: Koejawel
Zulu: ugwava

 

Psidium guajava

Psidium guajava Psidium guajava

CATEGORY:
2

CONTROL: Very difficult.  Regenerates vigorously from roots.
Manual: Pull out with lasso and winch where soil is sandy.
Chemical: Basal Stem: try GarlonŽ 4 400ml/10l diesel in June/July.  Cut stump: Use ChopperŽ 1250ml/10l water.   

DESCRIPTION: A number of forms occur in KZN (The fruit size differs). An evergreen shrub or tree up to 8 m tall, it has smooth stems with scaly bark in patches; oval to oblong-shaped opposite leaves on longish stalks with prominent veins and fine hairs on the under-surface; white flowers single or in groups of 2 or 3; round, egg or pear-shaped fruits pale yellow when ripe with pink flesh and a strong smell.  Flowering time: October to December.

ORIGIN: Originates from Mexico to northern South America and is cultivated throughout the tropics and sub-tropics for its fruit.

WHERE FOUND/PROBLEMS CAUSED: One of the most widespread and invasive plants along the KZN coastal belt.  Occurs in open veld, bushveld and indigenous forests.  Fruit is eaten by a wide range of birds and animals (including man) which helps disperse the seed. Grows rapidly and is extremely difficult and expensive to control once established. Is a host for fruit flies and wild stands of guavas can act as a source of infestation of fruit flies to other fruit in nearby orchards. May affect dispersal of indigenous species by attracting birds and changing their feeding habits.

DID YOU KNOW: This fruit is used for making preserves, jams, relish and chutneys.  Its juice is used for making fruit drinks and punch.  Although a proposed declared invader, it will probably not be declared a weed because of the value of the fruit.  Also a problem, Psidium cattleianum (Strawberry guava, Chinese guava) - red fruits.

Indigenous alternatives

Common Forest Myrtle Eugenia natalitia
Natal Medlar Lagynias lasiantha
Wild Medlar Vangueria infausta

This page was last edited on 23 April, 2006