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Pest & Disease
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Insect pests of banana in the Pacific Insect pests of banana can cause significant damage to fruits (e.g., thrips, moths/caterpillars, scales), leaves (e.g., mites, moths/caterpillars), corms, and pseudostems (e.g., weevils), and can transmit important plant pathogens (e.g., aphids transmit banana bunchy top virus). Damage due to insects can greatly reduce the marketability of banana fruits.
The banana aphid is a serious pest of banana due to its ability to transmit banana bunchy top virus (BBTV). Aphid excretion of “honeydew” provides a nutritional substrate for sooty mold fungi, which affects fruit quality and physically block photosynthesis. Banana aphid populations are often tended by ant species.
The Chinese rose beetle, Adoretus sinicus, and other rose beetles are common pests on all major banana-producing islands in Hawai‘i and the Pacific. The larvae primarily dwell in the soil and leaf litter surrounding the plant crop, and the adults do the damage to banana. The adult beetle is nocturnal and feeds primarily on leaf and interveinal tissue. Chinese rose beetle damage is most easily detected on younger plants.
A single injection, applied about one-third of the way down from the flower tip, is sufficient to provide control. Some varieties appear to be less susceptible to scab moth damage.
Fruit flies are significant quarantine pests for some destinations.
They attack ripe banana fruits.
Pseudococcus jackbeardsleyi (banana mealybug)
Dysmicoccus brevipes (pineapple mealybug)
Dysmicoccus neobrevipes (gray pineapple mealybug)
Ferrisia virgata (striped mealybug)
Pseudococcus orchidicola (orchid mealybug):
Mealybugs feed on banana leaves and fruits, but they are not a significant economic pest of Musa in most locations. Some mealybugs transmit banana streak virus (BSN).
Aonidiella aurantii (California red scale)
Aonidiella inornata (inornate scale)
Aspidiotus destructor (coconut scale)
Chrysomphalus dictyospermi (dictyospermum scale)
Coccus hesperidum (brown soft scale)
Coccus viridis (green scale)
Diaspis boisduvalii (boisduval scale)
Eucalymnatus tessellates (tessellated scale)
Hemiberlesia lataniae (latania scale)
Icerya aegyptiaca (Egyptian fluted scale)
Ischnaspis longirostris (black thread scale)
Pinnaspis buxi (ti scale)
Saissetia coffeae (hemispherical scale)
Steatococcus samaraius (steatococcus scale)
Thrips can scar, stain, or deform banana fruits by feeding on the fruit skin. Thrips are small, winged insects that feed on banana flowers and/or the tender green skin of developing fruits. Thrips outbreaks can occur during periods of dry weather.
The following thrips species are important pests of Musa in the Pacific region:
Chaetanaphothrips signipennis (banana rust thrips): Feeding by rust thrips creates areas of reddish-brown “rust” that develop on the banana fruit, especially where two adjacent fingers touch; skin cracking can occur, leading to severe damage. The damage is caused by thrips feeding on young, developing green banana fruits.
Thrips hawaiiensis (Hawaiian flower thrips):
Corky scab is caused by populations of the flower thrips (Thrips hawaiiensis) feeding on young, developing, green banana fruits. They cause a superficial corky scarring on the banana fruit skin; the scab is patchy, discolored, and raised.
Monitor the crop for flower thrips populations; spray registered insecticides; keep plants moist with overhead irrigation during dry periods.
Valanga nigricornis (Javanese grasshopper)
Proutista moesta (erect-winged blue plant hopper)
Lamenia caliginea (derbid planthopper)
Lamenia caliginea (a fulgorid planthopper)
Siphanta acuta (torpedo bug)
‘Cavendish’ varieties are resistant.
Drechslera gigantean (eye spot)
Curvularia sp.
Phyllosticta spp.
Hendersonia toruloides
Helminthosporium sp.
Cordana leaf spot is a common but minor leaf spot disease on most banana varieties but can be severe on plantain varieties. Symptoms are pale brown, oval patches on leaves, surrounded by bright yellow halos. The disease may be controlled with the same fungicides used to control the
sigatoka diseases.
Pythium arrhenomanes
Pythium aphanidermatum
Pythium sp.
Marasmiellus inoderma (stem rot)
A sometimes-severe pseudostem disease occurring in marginal soils (soils with poor nutrition or physical structure, low in organic matter, high in clay) or poorly drained or wet areas where M. inoderma occurs. The causal fungus is able to penetrate leaves, pseudostems, or roots to cause the following symptoms: decay and withering of outer leaf sheaths/blades; leaf stunting; cracked pseudostems; slow plant growth; plant stunting and death; and narrow pseudostems. White mushrooms often appear along the cracks in the affected pseudostems. Alternative hosts of M.
inoderma include coconut, rice, taro, and maize.
Infection leads to swelling and galling of banana roots. Galled roots may crack and rot. Plants rise from the soil (“float”) and can topple during bunch development coupled with wet weather or water draining through the field. Rootknot nematodes can make a field unusable for commercial
banana production after 5 years.
Rotylenchulus reniformis, Rotylenchulus sp. (reniform
nematode)
Pratylenchus coffeae (lesion nematode)
Tylenchorhynchus sp. (stunt nematode)
Criconemoides sphaerocephalum (ring nematode) Criconemella sphaerocephala
Hoplolaimus sp.
The virions of BSV were first isolated in 1985 (Lockhart 1986) and are bacilliform in shape (ca 30 x 120 nm), containing a dsDNA genome of ca 7.4 kbp. A high degree of genomic and serological heterogeneity between BSV isolates has meant that indexing can be problematic. The virus is transmitted in a semipersistent manner by mealybugs and also through vegetative planting material. Long distance spread is primarily due to the use of infected planting material, including micropropagated plants. The mealybug vector can spread the disease locally, though this is thought to occur very slowly and over short distances. The use of infected planting material can also be responsible for local spread. It has been reported that the disease may be seed transmitted and this possibility is being further investigated.The late diagnosis is probably because it is a highly variable virus, which makes detection and indexing difficult. The virus is widespread, and has probably existed for a very long time. Symptoms (see photos below) tend to be more severe in poorly managed plantations. The symptoms consist of a combination of chlorotic streaks (broken or continuous) and narrow lesions on leaves. As the leaves age, the yellow streaks may turn brown and necrotic, resulting in a pattern of fine black streaks running parallel to leaf veins. Diseased plants may be stunted and have smaller bunches. Banana streak is transmitted by mealybugs.
Use of pathogen-free planting material and control of alternate hosts (weeds, legumes, cucurbits, members of the Solanaceae, such as tomato).
Abiotic fruit disorders reduce fruit quality and may reduce fruit grade or render fruit unmarketable.
Choke throat is seasonal in nature. It is usually worst in the winter and early spring following cold weather. However, it can also occur following periods of waterlogging or severe water stress and following wind storms. Two factors contribute to the actual difficulty in bunch emergence: (a) due to a reduction in the elongation of internodes of the true stem bearing the bunch inside the pseudostem (pseudo = false) and (b) the stiffness of the leaf bases at the top of the pseudostem can prevent proper bunch emergence. Some varieties are more susceptible to this disorder than others. Notably Williams and Mons Mari are far less susceptible than Dwarf Cavendish. Choke throat is often associated with dwarf varieties. Dwarf off-types from tissue culture are particularly susceptible.
Management:
- Select taller varieties, which are less susceptible to choke, throat, eg Williams.
- Choose a warm environment, one which is well protected from frosts and strong winds. Slopes facing the north and north west are usually warmer.
- Control time of bunching to avoid cold weather prior to bunching. Plants bunching in the late spring to mid autumn are less affected.
- Good on-farm drainage measures including mounding of rows.
- Regular irrigation to avoid water stress particularly during hot-dry weather.
- Higher nitrogen rates are thought to be beneficial.
is associated with the forced ripening of overly mature banana fruits.
Wild birds, bats, and rodents not only feed on banana fruits but often construct nests within the bunch, poised to feed their young when the bananas ripen. Rats can be a serious problem; therefore bananas should be harvested just before or at the first sign of rat damage, then hung upside-down in a rat-free environment until ripe.
- Englberger, L. 2003. Carotenoid-rich bananas in Micronesia. InfoMusa 12(2): 2–5.
- “FAOSTAT: ProdSTAT: Crops”. Food and Agriculture Organization. 2005.
http://faostat.fao.org/site/567/DesktopDefault.aspx?PageID=567. Retrieved on 09-12-2006. - http://agroforestry.net/tti/Musa-banana-plantain.pdf
- http://www.ctahr.hawaii.edu/nelsons/banana/
- Kepler, A.K., and F.G. Rust. 2005. Bananas and Plantains of French Polynesia. Part I Traditional Non-Fe‘i Bananas: Descriptions, color photographs, status, and possible kinships with Hawai‘i’s ancestral bananas. Part II Color photographs of Western introduced Varieties. Part III Names & Synonyms of Extant and Recently Extirpated Varieties, Tahiti & the Marquesas Islands. Part IV Traditional Non-Fe‘i Banana Varieties, Society and Marquesas Islands: Known Historical Names, Meanings, and Locations dating back to the mid-19th Century. Part V Appendices. Unpublished.
- Lassoudiere, A., 1974. La mosaïque dite a tirets du bananier Poyo en Cote d’ Ivoire. Fruits,. 29: 349-357. Page 4. Int. J. Virol, 3 (2): 96-99.
- Lockhart, B.E. 1986. Occurence of canna yellow mottle virus in North America. Phytopathology 76: 995.
- Nelson, S.C., R.C. Ploetz, and A.K. Kepler. 2006. Musa species (bananas and plantains), ver. 2.2. In: Elevitch, C.R. (ed.). Species Profiles for Pacific Island Agroforestry. Permanent Agriculture Resources (PAR), Hōlualoa, Hawai‘i. <http:// www.traditionaltree.org>
- Olorunda AO, Aworh OC. 1984. Effects of Tal Prolong, a surface coating agent, on the shelf life and quality attributes of plantains. Journal of the Science of Food and Agriculture 35: 573-578.
- Rene Rafael C. Espino, Ph. D., et al, 2000.Banana Production.“Tracing antiquity of banana cultivation in Papua New Guinea”. The Australia & Pacific Science Foundation.http://apscience.org.au/projects/PBF_02_3/pbf_02_3.htm. Retrieved on 2007-09-18
- Yueming Jiang1, , Daryl C. Joyce3, Weibao Jiang4 and Wangjin Lu. 2004. Effects of Chilling Temperatures on Ethylene Binding by Banana Fruit Plant Growth Regulation 43: 109–115, 2004.Kluwer Academic Publishers. Printed in the Netherlands.