Forest and Timber Insects in New Zealand No. 59. New Zealand Drywood Termite. Insect: Kalotermes brouni Froggatt (Isoptera: Kalotermitidae)
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1 Forest and Timber Insects in New Zealand No. 59 New Zealand Drywood Termite Insect: Kalotermes brouni Froggatt (Isoptera: Kalotermitidae) Based on R.H. Milligan (1984) Fig. 1 - Soldier of Kalotermes brouni. Type of injury Nests of the New Zealand drywood termite are found in dead, sound wood. Dead, standing or fallen trees, logs lying in exposed situations, fence posts, power and telephone poles, and construction timber that has not been treated with preservatives can be suitable for nest establishment. The dead wood (heartwood) at the centre of living trees may also be invaded if the termites can gain access. Where nests are well established the earlywood bands of the timber will be destroyed, leaving a series of longitudinal galleries separated by residual bands of latewood (Fig. 2). Smaller interconnecting passageways, which are roughly circular or broadly oval in cross section, may also be present, and may link subcolonies to the main nest. Even though no particular pattern typifies the workings, they can be immediately identified as those of a drywood termite by the shape of the faecal pellets found in disused parts of the galleries (Fig. 3). Except for the occasional small holes through which the winged adults emerge, the exterior surfaces of the timber remain intact. Hosts This termite will utilise dead, dry wood of a wide range of indigenous and exotic hardwoods and softwoods, and no timber species grown in New Zealand is known to be specifically resistant to damage. In living trees it has been recorded from the heartwood of Pinus radiata (radiata pine), Cupressus macrocarpa (macrocarpa), Eucalyptus (eucalypts), Metrosideros excelsa (pohutukawa), and Sophora (kowhai). Ent_59_Kalotermes_ brouni.doc Page 1
2 Fig. 2 - Workings of K brouni. Fig. 3 - Faecal pellets of drywood termites are elongate, rounded at each end, and hexagonal in cross section over most of their length Distribution This native insect occurs throughout New Zealand. Economic importance Drywood termite damage to heartwood may be so extensive within a living tree as to render logs useless for sawing (Fig. 4). In the past, heartwood damage was thought to be confined to trees that were open grown, or grown as shelter belts, but in recent years this type of damage has been Ent_59_Kalotermes_ brouni.doc Page 2
3 found in pine trees in forests north of Auckland and in the Coromandel Peninsula. Although the incidence is not high it is of concern to forest and mill managers. Fig. 4 - Heartwood of living radiata pine destroyed by K. brouni. The presence of the insects in branch stubs is of no importance when trees are taken for use in New Zealand, or are milled before export, because the infestations are removed with the waste slabs during sawing. However, such logs will be rejected for export unless they are first fumigated with methyl bromide. In buildings, conditions favouring development of drywood termites also suit the larvae of twotoothed longhorn and house borer beetles (Leaflet No. 26 and 32), so it is rare for drywood termites to be the sole deteriorating agent. However, as building timber does not usually exceed 75 cm 2 in cross section, the presence of even small nests can cause areas of structural weakness. In addition, because exit holes are inconspicuous and few in number, the damage may remain undetected and become widespread in the building before the need for remedial action is realised. Houses closely surrounded by neglected shelter trees may be more susceptible to damage than others. Description Different sorts of individuals (castes) arise from the eggs of drywood termites. The relative numbers of each caste are regulated by the needs of the particular community and controlled by hormones passed around during feeding. By far the most numerous occupants of a nest are the young or "nymphs" (Fig. 5). They are white to pale yellow, except for the jaws which are dark brown to black. External wing buds are present which become larger each time the nymph sheds its skin. The nymph moults several times before reaching a final length of about 5 mm. The more nature nymphs undertake the function of workers - extending the galleries, removing debris, and tending the queen and other dependent members of the colony. A sterile worker caste, such as occurs in some other groups of termites, is not found in the family Kalotermitidae. Most nymphs ultimately develop into winged male or female reproductives (Fig. 6) which emerge, disperse, during mass flights, and pair. However, only a few pairs succeed in establishing new colonies elsewhere. A winged reproductive has two sets of greyish wings which, at rest, lie flat over the abdomen and project about 5 mm beyond its apex. Its body is Ent_59_Kalotermes_ brouni.doc Page 3
4 about 5 mm long and yellowish brown. Its head is shaped like a sphere flattened above and below and bears moderately long, thread-like antennae. The segment behind the head is saddleshaped, and wider than the head. The front part of the abdomen is narrower than the head, and widens out towards the rear. Near the base of each wing is a line of weakness. Before a pair of reproductives begin to tunnel into fresh host material, the wings are deliberately broken off at these places. The wing stubs -that remain distinguish the founders of the colony from their winged offspring. The female founder can also be distinguished by her greatly enlarged abdomen. Fig. 5 - Nymphs of K. brouni. Fig. 6 - Winged reproductives of K. brouni. (Heads and antennae became folded underneath when these specimens died.) If a parent pair, or just the mated female, or queen, should die, or if part of the colony becomes separated from the queen, nymphal males and females can become sexually mature even though their body forms remain immature and functional wings are not developed. These "emergency" reproductives resemble larger nymphs, except that the abdomen of the female may be enlarged. They serve, to maintain the population of the nest in the face of natural mortality. Some sterile individuals of both sexes develop unusually large and abnormally shaped heads which are dark red in front and paler behind, almost twice as long as they are broad, parallelsided, and rounded at the rear. They have robust black jaws which are about a third as long as the head (Fig. 1). This is the soldier caste which protects the colony against insect invaders, Ent_59_Kalotermes_ brouni.doc Page 4
5 particularly ants. The jaws of the soldiers are especially shaped for seizing invaders, and are quite unsuitable for gouging out wood particles, so soldiers must be fed by other members of the colony. Life history and habits The lifespan of a mature New Zealand drywood termite, the time taken for individuals to develop from egg to adult, and the length of each of the developmental stages are all unknown. The development of a colony is usually a slow process, but once established its life is limited only by the availability of sound, dry wood. After swarming flights in the late summer or autumn, each pair of winged reproductives selects a site for the establishment of a new colony. Preferred sites are the flight holes and pupal chambers abandoned by longhorn beetles, but other concealed situations may serve. Where living pine trees are chosen, pairs start from dry suppressed or broken branches which have previously been invaded by longhorn beetles such as Stenopotes pallidus (Leaflet No. 6). In macrocarpa, exit holes of the longhorn beetle, Eburilla sericea, in recently killed branches, or those of the twotoothed longhorn beetle, Ambeodontus tristis (Leaflet No. 26), in older dead wood are common entry points. The drywood termites may then advance into the heartwood through the traces of the dead branches (Fig. 7). Fig. 7 - Damage to heartwood of living radiata pine after K. brouni entry via branch stub. Success of drywood termites in living trees appears to depend on dead branch stubs remaining so dry that they are not rapidly broken down by rot fungi and insects. If suppressed lower branches rapidly decay back to the living stem then the branch traces become overgrown by new wood and no longer provide a pathway which drywood termites can follow to the heartwood. In conifers, resin reactions of living sapwood to wounding can also effectively deter would-be insect invaders. Control Heartwood damage is least likely if broken and suppressed branches are pruned back to the living stem, and dead dry wood on the ground which could harbour colonies is destroyed. Damage to new buildings is best prevented by the consistent use of preservative-treated timbers. Drywood termite damage in old buildings is unlikely to be detected until timbers are seriously Ent_59_Kalotermes_ brouni.doc Page 5
6 weakened, so a full survey of the extent of the damage should be made before attempting to eradicate the insects. If timbers are only slightly damaged remedial treatments such as fumigation or injection of insecticides may be appropriate, but weakened timbers should be replaced. References Bain, J.; Jenkin, M.J. 1983: Kalotermes banksiae, Glyptotermes brevicornis and other termites (Isoptera) in New Zealand. New Zealand Entomologist 7: Kelsey, J.M. 1944: The identification of termites in New Zealand. New Zealand Journal of Science and Technology 258: Kelsey, J. M. 1946: Insects attacking milled timber, poles and posts in New Zealand. New Zealand Journal of Science and Technology 288: Milligan, R.H. 1984: Kalotermes brouni Froggatt, (Isopetra: Kalotermitidae). New Zealand drywood termite. New Zealand Forest Service, Forest and Timber Insects in New Zealand No. 59. Zondag, R. 1959: Attack by Calotermes brouni Frogg. on living Pinus radiata. New Zealand Entomologist 2: Introduced Drywood Termites Two Australian drywood termites (Kalotermitidae) are present in New Zealand. Neither has yet been found in forests, and neither is expected to be of any economic importance. Generally the easiest way to identify the species is by the shape of the head and jaws of the soldiers (Fig. 8). (1) Glyptotermes brevicornis Froggatt. 1Discovered in March 1977 in Auckland, and later the same year found at Whangarei. New Zealand hosts have been logs or dead parts of live trees of radiata pine, Pinus pinester (maritime pine) and what was believed to be Cupressus (cypress) and Sequoia (coast redwood). In Australia it inhabits a variety of hardwood and softwood stumps and logs. (2) Kalotermes banksiae Hill. This termite has been present in New Zealand since at least It is established in the North Island on the east coast of the Coromandel Peninsula, and along the coastline from Castlecliff Beach near Wanganui to as far south as Waitarere. In the South Island it is found from Farewell Spit to the Boulder Bank in Nelson, on the Marlborough Coast at Kekerengu, and at Cape Foulwind near Westport. New Zealand hosts have been driftwood, branches, fairly sound logs, or tree stumps of radiata and other pines, Salix (willow), Nothofagus fusca (red beech) and N. menziesii (silver beech) either on or very close to sandy beaches. In Australia it is known from logs and dead snags of Banksia integrifolia (coast honeysuckle tree), Myoporum (ngaio), Eucalyptus, and Casurina (sheoke). There is one Australian report of it in pine door frames and Eucalyptus marginata (jarrah) door sills. AS in New Zealand all sites were on sand near the coast. An observation that may aid in field identification of this termite is that the soldiers seem more numerous and more active than those of K. brouni. Ent_59_Kalotermes_ brouni.doc Page 6
7 Fig. 8 - A comparison of the head and jaws of the soldiers of the drywood termite species present in New Zealand. A Kalotermes brouni - New Zealand drywood termite. B Kalotermes banksiae - introduced Australian species. C Glyptotermes brevicornis - introduced Australian species. Note: i The relative lengths of the jaws. Kalotermes banksiae the longest; G. brevicornis the shortest. ii The relative size of the beads. (However, oven within a single colony there is often quite a range of sizes, and so there is some overlap between the species. It is the relative proportions that are important.) iii The prominent flange on K. banksiae which is a useful identification character. Compiled: Ent_59_Kalotermes_ brouni.doc Page 7
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