western-queensland-gardening-guide.pdf - South West NRM

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Stem injections of insecticides to control pests in trees Insect pests in large trees are often hard to control using normal methods such as spraying. An alternative technique is to "inject" the tree with insecticides which are systemic. These insecticides go through the sap flow to poison any pests which eat parts of the tree. The technique is reasonably simple, but provides only short- term control and does cause some damage to the tree. It should only be done to control heavy infestations which seriously threaten the health of the tree. It is also recommended that trees be given water and fertiliser and/or lime, dolomite or gypsum as required, to promote uptake of chemicals and recovery and continuing good health of the tree. Trees which are badly affected and in serious decline may not benefit. Method of stem injection Holes should be drilled only as far as the sapwood of the tree and not further into the heartwood (see Figure 22). Holes are drilled with an 8 (3/8 inch) drill bit (or similar size) at a downward angle of up to 4 5 O into the trunk of the tree at a convenient height. Holes are drilled around the tree at a rate of 1 hole per 7.5 cm diameter of trunk, (that is a tree with a trunk 30 crn wide requires four holes). The holes should then be filled with Rogor 400 (dimethoate) insecticide using an eye-dropper or squirt-bottle to achieve 2 mL of chemical in each hole. If the hole cannot take 2mL allow half an hour for some of the chemical to soak in, then add the remaining chemical. It is important to inject the insecticide i holes are drilled to ensure continuous sap flow. The holes should be left for a several hours to allow for chemical absorption and then plugged with either wooden dowels or putty. The holes cannot be reused. tree Figure 22. Injecting insecticides into a tree
Page 1 and 2:
Information Series QI96050 Gardenin
Page 3:
Acknowledgments This booklet is mad
Page 6 and 7:
Chapter 1. Gardening with bore wate
Page 8 and 9:
At the neutral pH level, that is 7,
Page 10 and 11:
Sulphur can also be a very useful w
Page 12 and 13:
Table 1. Recommended pH range a. Fl
Page 14 and 15:
Table 2. Australian native plants s
Page 16 and 17: B. Exotic trees, shrubs and creeper
Page 18 and 19: Table 5. Species lists for heavylcl
Page 20 and 21: Chapter 2. Growing better lawns Kee
Page 22 and 23: Some of the fertilisers will absorb
Page 24 and 25: fertilised regularly to promote vig
Page 26 and 27: Suitable species This is a big subj
Page 28 and 29: A lot of people water pot plants by
Page 30 and 31: Preparing the hole Dig a hole about
Page 32 and 33: Ferti Iiser A small application of
Page 34 and 35: Plant into deep soil moisture Good
Page 36 and 37: The tree's growing space extends ar
Page 38 and 39: Mulching: For mulching to be effect
Page 40 and 41: Particulars for mulch application S
Page 42 and 43: Fertilising native trees Most nativ
Page 44 and 45: Table 7. Types of fertiliser Note:
Page 46 and 47: Figure 18. Simple home-made guards
Page 48 and 49: Chapter 5. Propagation of trees and
Page 50 and 51: Gently water in the seed and keep i
Page 52 and 53: Fertilising: It is necessary to sup
Page 54 and 55: Follow safety warnings Most materia
Page 56 and 57: mite wax scale White wax scale (Gra
Page 58 and 59: Vegetables Insect pests of curctrrb
Page 60 and 61: Caterpillars or grubs on vegetables
Page 62 and 63: Roses and other flowers Dieback in
Page 64 and 65: an eye dropper or an oil can, injec
Page 68 and 69: Chapter 8: ich pesticide to use (Ad
Page 70 and 71: Table 12. The easy guide to chemica
Page 72 and 73: Nicotine spray This spray has been
Page 74 and 75: &e%tuce This deters most insects. I
Page 76 and 77: Index Aphids 54 Ants 18 Australian
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