For gardeners on the east coast – don’t forget that it is a legal requirement in some areas to remove galls from citrus trees by the end of August. Gall wasps lay eggs in main stems or fruit stalks. This forms a swelling and gall wasp larvae weaken trees. As trees may be forming blossoms, delay in pruning may reduce next year’s crop. If you haven’t done so, check citrus trees (especially grapefruit and lemons) this week and prune off any galls before adult wasps emerge to lay eggs in new shoots. Burn affected prunings or dispose of them in a sealed plastic bag. See: Citrus gall wasp
Column 8 in today’s Sydney Morning Herald stated that Sydneysiders’ kitchens have been infested by fruit flies, stating that, “They emerge from fruit and hang around all summer”. The flies referred to are not fruit flies, they are the very small vinegar or ferment flies (Drosophila). Genuine fruit flies are kept out by fly screens. Vinegar flies emerge from fruit, tomatoes, etc. as grubs (larvae) and require pupation outside the fruit in order to complete their life cycle as a fly. If these tiny pests are a persistent problem, there must be a breeding ground nearby or the kitchen needs more regular cleaning.
Vinegar flies are attracted to the smell of yeast in fermenting organic materials and drains. To eliminate the problem:
- Do not keep fruit at room temperature in warm, humid weather
- Cover compost and garbage containers
- Regularly rinse out garbage containers
- Rinse beer and wine containers before recycling
- and treat drains with an enzyme product to break down thick scum where they can feed and reproduce.
Genuine fruit flies, the Mediterranean Fruit Fly (Ceratitis capitata) and Queensland Fruit Fly (Dacus tryoni) cause a lot of destruction in gardens. They require pupation in soil after the maggots emerge from fruit. To reduce the problem of genuine fruit flies, collect all fallen fruit, put it in a sealed black garbage bag and leave the bag in the sun for three or four days to cook the larvae (and encourage your neighbours to do the same). Never put infected fruit in the compost container.
A reader wanted to know what what is causing yellowing of new leaves in her potted, dwarf lemon tree. From the photos she e-mailed, it does look like this tree has an iron deficiency, as yellowing is showing in the young leaves. This can be caused by a number of conditions:
a) potting mix (or soil) that is too alkaline from excess bio-char or calcium in the mix or fertiliser containing a lot of poultry manure
b) cold and wet soil or growing mix
c) if there is a build up of fertiliser salts from synthetic fertilisers, or
d) where there is an excess of potassium from synthetic fertilisers or over-use of seaweed liquid fertiliser.
The first thing to do is check that your pot has ample drainage. Large pots should not sit directly on a hard surface. While smaller pots usually have ample drainage holes around the sides at the base of the pots, large pots often have only one large hole in the base and this can easily become blocked resulting in poor aeration and/or a concentration of fertiliser salts if synthetic fertilisers have been used. Large pots should have pieces of tile placed under the pot to allow a small space between the base of the pot and the verandah or paving. If you notice crusting around the top of the soil line (fertiliser salts), flush the plant with clean water, once drainage has been improved.
The next step is to check the pH of the mix with a test kit. A suitable pH is important to all parts of your garden as the pH in soil or mix controls the availability of nutrients. Test kits are very economical to use and readily available from larger nurseries. If you find that the pH is above 7.2, you could repot the tree using an organic-registered potting mix as organic matter is an important source of iron. However, to do so may result in the loss of this crop of fruit.
The addition of flowers of sulphur (elemental sulphur) is the usual way to reduce pH in soils, but it is easy to overdo this in potted plants. You can apply iron chelates (the form of iron in organic compost) to the mix in the pot at the recommended rate. Citrus trees do not absorb iron chelates well through foliar spraying. Or, you can fertilise the tree with a weak solution of Multicrop’s Ecofish. This is an organic-registered liquid fertiliser that contains soluble iron and has a low pH, qhich will help to reduce the pH in the pot. Ecofish contains iron, manganese, sulphur and zinc (trace elements needed by citrus). Manganese deficiency is also caused by high pH or poorly-drained soil.