Common problems with tropical fruit trees in the home landscape
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1 Common problems with tropical fruit trees in the home landscape Jonathan H. Crane, Tropical Fruit Crop Specialist, University of Florida, IFAS, Tropical Research and Education Center, Homestead
2 Common problems for tropical fruit crops in the home landscape Pollination Issues Plant nutrition Issues Watering Issue Environmental Issues freezing, flooding, wind, light, and salinity Soil amendment Issue
3 Pollination
4 Pollination Issues Some fruit species are dioecious, i.e., have separate male and female trees and you need both to produce fruit, e.g., mamoncillo (genip) and some papaya cultivars. Some cultivars of some fruit crops require cross pollination, i.e., you need two different cultivars to set fruit. For example, B-17 carambola, Possum Purple passion fruit. Many fruit species/cultivars do better with cross pollination, e.g., many avocado cultivars and some mango cultivars. Some fruit crops like Annonaceae are pollinated by beetles not honey bees. If the beetle population is not sufficient then pollination may not occur. Hand pollination is an option to increase the percent fruit set, improve fruit quality, and yields.
5 Species with potential pollination problems Avocado Carambola Annona (sugar apple) Atemoya Papaya Passion fruit Lychee Sapodilla Species generally without pollination problems Mango Banana Longan Mamey sapote
6 Pollination issues Avocado Cultivars that do not require cross pollination: Waldin, Lula, and Taylor. Cultivars that require cross pollination Pollock and Booth 8. Bottom-line: avocado fruit set and fruit production increases when cross pollination occurs. Solution: Plant complimentary avocado cultivars (A+B types) or scout neighborhood for other avocado trees that may be able to pollinate your tree. Carambola Cultivars that require or do much better with cross pollination: B- 10 and B-17. Cultivars that do not require cross pollination: Arkin, Kary, Sri Kembangan, and many others. Solution: Plant a cultivar that does not require cross pollination or plant more than one cultivar.
7 Pollination issues Annona (sugar apple) + Atemoya Requires pollination by Nitidulid (sap) beetles or may be hand pollinated. Normally flowers open functionally as female first and then become functionally male. May be hand pollinated for improved fruit shape, size, and production. Papaya There are 3 basic papaya plant types male, female, bisexual plants. There are no fruit set issues with bisexual trees. However, female trees require pollination from either male trees or bisexual trees. Male trees generally do not set fruit and when they do it is of inferior quality.
8 Pollination issues Passion fruit Purple types and some purple x yellow hybrids require cross pollination. Yellow types generally do not require cross pollination to fruit well. Hand pollination is easy put on cotton gloves and place pollen on your fingers from one flower then touch the stigma of other flowers. Some fruit species do that do not require cross pollination have been shown to improve their fruit set and production when cross pollinated - Lychee Sapodilla Guava
9 Plant Nutrition
10 Plant nutrition issues A major fruit tree problem in Miami-Dade County are secondary and micronutrient element deficiencies. The most common deficiencies are magnesium (secondary), iron, manganese, and zinc. Lack of essential elements affect plant health and thus decrease plant growth, flowering and fruit production. Lack of consistent fertilization with needed plant nutrients results in poor tree health and/or biannual fruit production (i.e., a lot of fruit 1 year and little to none the next). Lack of or too much nitrogen reduces flowering and fruit production. The amount to apply depends upon the fruit species, tree size, and the time of year. See the factsheets for details. Typically homeowners do not consistently fertilize their trees or when they do fertilizer (very occasionally) they over apply fertilizer which either causes damage to the leaves (salt-burn) or vigorous leaf and shoot growth and little to no flowering.
11 Plant nutrition issues The major theme to emphasize is to follow the recommendations in the factsheets ( or Simply, it is better to use small amounts of fertilizer frequently during the warmer months of the year (March-April to September). Fertilizer applications during the late fall-winter period are either less effective or undesirable depending upon the fruit crop. Solutions to secondary and micronutrient deficiencies - Use a foliar micronutrient mix and apply to the leaves 3-4 times per year (anytime from March-Sept.). Ideally purchase and apply a soil drench of chelated iron 2-4 times per year. Alternatively, you can try a mix of iron (iron sulfate or iron oxide) and compost and apply to the soil under the tree canopy.
12 Watering
13 Watering Issues Over watering is especially a problem in landscapes with automatic sprinkler systems. Over watering - causes oxygen starvation in the root zone. leaches plant nutrients beyond the root zone. Under watering is an issue for young trees just planted, during the first 3 years or so, or mature trees with a lot of fruit (except mango). Young trees need consistent watering during dry periods to survive or grow. Many fruit crops with fruit need consistent watering during dry periods to either hold the fruit to maturity or to produce high quality fruit. Examples include carambola, longan, lychee, and papaya. In contrast, some fruit crops such as established mango trees should rarely be watered. Watering (especially overwatering) may reduce fruit quality.
14 Soil amendments
15 Soil amendments Soil amendments are commonly top soil, muck, sludge, sand, and compost or some mixture thereof. However, because improper use of a soil amendment may harm the health of trees and the diversity of amendments and confusion about their use, i.e., how to tell a good one from a poor one, and how to use it, it may be better not to recommend a soil amendment to inexperienced people. However, if someone feels they need a soil amendment, please see the next slide.
16 Soil amendments Soil amendments such as top soil, sand, and well composted sludge and compost should only be used in a limited amount in the planting hole. Furthermore, these materials should only be mixed with the native soil in no more than a 60% native soil/40% amendment mixture. The reason for this is that if too much soil amendment is used, movement of water between the soil in the planting hole and the native soil may be impeded leading to root rot and decline of the tree.
17 Environmental Issues
18 Environmental Issues Freezing temperatures are the most common problem faced by homeowners with fruit trees in the home landscape. Flooding can be a problem in low lying areas or during/after tropical storms and hurricanes. Wind damage can be a problem especially if trees are allowed to become overgrown. Salinity water and/or soil is a problem in some areas, especially along the coast and in the Keys. Constant low light levels leads to loss of tree canopy, poor fruit production, and lower fruit quality.
19 Freezing Temperatures
20 Site selection Geographic location near coast is warmer S or SE side near large bodies of water the leeward side (S, SE) of wind breaks may be colder than the windward (N, NW) side low lying areas are colder than higher elevations Urban residents - planting near buildings is generally warmer in the SE side of the yard trees planted under the canopy of other trees near large bodies of water
21 Banana grown adjacent to a southwest wall protects the plants during cold weather. In contrast, the shade from the banana plants cool the southwest wall in summer.
22 Young mamey sapote tree sugar apple tree in northeast area of landscape adjacent to a canal and wall of the home (warm site). Mango tree in southeast area of the landscape about 30 ft from the street.
23 Sweetheart lychee along east side of home. Star fruit tree with Alocasia odora border in eastern side of landscape. Wind protected by other trees.
24 Clean culture Definition: The absence of vegetation i.e. grass and weeds on the grove floor. Benefit: Allows solar heat to penetrate soil surface and be stored for re-radiation at night. Note: mulch and grass prevents penetration of solar radiation into soil. The mulch may be pulled back from November to March to facilitate exposure of the bare ground to sunlight. Not highly effective in south Miami-Dade County because the high porosity of the rockland makes the soil a poor conductor of heat. In areas with sandy soils, removing sod or pulling mulch back to the outside the drip-line weeks ahead of cold weather may allow the soil to act as a source of heat during cold weather (called a heat bank).
25 Clean culture Drip-line Drip-line Mulch pulled back No grass or mulch from about the drip-line to the trunk
26 Prefreeze watering Water has a high capacity to store heat. Irrigating the ground under and around the fruit trees several days prior to a cold/freeze event will increase the soil s capacity to store and re-radiate heat during freezing temperatures. The greater the surface area wetted the greater the soil heat storing capacity. Irrigating during the daytime prior to the night of a predicted freeze is not recommended, especially if it is already cold and/or windy.
27 Soil banks and tree wraps Soil banks effective for young trees effective for young trees planted in sandy soils Use: clean soil, mound up 2-3 ft, check bank/tree trunk for insects and diseases remove bank after danger of freeze/ frost is over Tree wraps may be made out of fiberglass insulation and chicken wire only delay heat loss should be constructed of material with a high insulation value need to be removed after winter Not possible with rockdale soil. Only effective for young trees. Not tested on tropical fruit crops.
28 Soil bank
29 Tree wrap
30 Types: individual and row/quonset-hut type. May provide some protection. Has been used on young orange trees. Has not been tested on tropical fruit crops. Caution: any tree surface touching the cover may be damaged. Expensive and time consuming to implement. Plastic tree covers
31 Flooding
32 Flooding issues Soils with a hardpan in the soil profile which impedes water drainage. Areas where the water table may rise into the root zone, is near the soil surface and/or fluctuates into the root zone. The effect of excessively wet soils on plants depends upon their inherent flood tolerance, the growth stage of the plant (i.e., actively growing vs dormant), the duration of wet soil conditions, time of year (e.g., summer vs winter), and how often the area experiences excessively wet soil conditions. Low lying areas are prone to flooding or excessive water in the root zone.
33 Potential solutions to avoid excessive soil moisture and flooding Shallow sandy soils with a hardpan may require augering through the hard pan to improve soil drainage and/or construction of mounds or beds for safely planting tropical and subtropical fruit trees in the home landscape. Construction of mounds made from native soil may increase the amount of roots above flood waters.
34 Mound construction Select sites in the landscape that do not flood. In places that have high water table or periodically flood, plant trees on mounds constructed of native soil. Mounds should be 1-3 ft high and 3-10 ft in diameter. Aerial view of 3-10 ft dia. mound 1-3 ft Side view of mound
35 Recommendations to avoid or minimize flooding damage On sites that may periodically flood select only flood tolerant fruit species (see fact sheet HS202). On sites with a hardpan, if possible dig into or auger planting holes past the hardpan to improve water drainage. On low lying sites plant fruit trees on beds.
36 Wind
37 Wind and storm damage The most reliable method for minimizing and avoiding severe wind damage to tropical fruit trees in the home landscape (and possibly to your home) is to maintain trees at a reasonable height with annual or biannual pruning. Fruit trees should be maintained at a height where cultural practices (e.g., insect and disease control) and harvesting can all be done from the standing on the ground. Training young trees and maintaining mature trees at a reasonable height will reduce storm damage to the tree and surrounding structures and landscape. Very large trees should be pruned by a licensed and insured arborist.
38 Table 1. Recommended Plant Height for Tropical Fruit Trees Grown in the Home Landscape in Florida. Common Name Scientific Name Recommended Maintenance Tree Height (ft) Abiu Pouteria caimito 8-12 Atemoya Annona cherimola x A. squamosa 8-12 Avocado Persea Americana Banana Musa hybrids --- Black sapote Diospyros digyna Caimito (star apple) Chyrsophyllum cainito 8-12 Canistel (egg fruit) Pouteria campechiana Carambola Averrhoa carambola 6-12 Cashew Anacardium occidentale Citrus Citrus species Cocoa Theobroma cacao 6-8 Coconut Cocos nucifera --- Coffee Coffea arabica, C. canephora 5-15 Guava Psidium guajava 3-12 Jaboticaba Myrciaria cauliflora 8-12
39 Common Name Scientific Name Recommended Maintenance Tree Height (ft) Jackfruit Artocarpus heterophyllus 8-14 Longan Dimocarpus longana Loquat Eriobotrya japonica 6-12 Lychee Litchi chinensis Macadamia Macadamia integrifolia and M. tetraphylla Mamey sapote Pouteria sapota Mamoncillo Melicocus bijugatus Mango Mangifera indica 6-15 Pineapple Annanas comosus --- Pitaya Hylocereus undatus and hybrids --- Sapodilla Manilkara zapota Soursop Annona muricata 8-12 Spondias Spondias species 8-12 Sugar apple Annona squamosa 8-12 Tea z Camellia sinensis 5-6 White sapote Casimiroa edulis and C. tetrameria 10-15
40 Light
41 Light exposure and tree spacing In general, fruit crops grow and produce best when exposed to full sunlight. Shaded trees tend to be weak growing and less productive. The lower limbs of mature trees may be lost if shaded for too many hours of the day, resulting in fruit trees that only have fruit far from the ground. The ultimate size of fruit trees varies with species and growing conditions. Some have the potential to grow very large (e.g., mango, avocado, sapodilla), others are inherently smaller (e.g., guava, sugar apple, jaboticaba).
42 Tree spacing and pruning Avocado, mango, lychee, mamey sapote, and loquat should be planted ft or more from buildings and other trees. These trees should be selectively pruned and maintained to a manageable height each year. Carambola, sugar apple, atemoya, and guava should be planted 20 ft or more from buildings and other trees and should be selectively pruned and maintained at a manageable height each year. Jaboticaba are small bush-like trees and may be planted 10 ft away from buildings and other trees. Managing tree height and spread is key to maintaining sufficient light levels and the lower fruit producing canopy of fruit trees. Young trees may be trained to a low stature by selecting the initial branches and increasing the number of branches. Periodic selective pruning of mature trees to open the canopy and to limit the spread of the canopy will maintain light levels throughout the canopy.
43 Salinity
44 Salinity and access to water Salinity is the amount of salts in the soil solution or irrigation water. Salts may accumulate in the soil adjacent to the coast or canals by irrigation with saline water and/or salt water intrusion. Salinity is measured by how well an electric current can flow through the soil solution or irrigation water; the higher the salinity the higher electrical conductivity (EC) or total dissolved salts (TDS).
45 Salinity and access to water You can have your water tested for salinity* Water quality ds/m TDS (total dissolved salts) ppm Excellent Good Permissible Doubtful Unsuitable >3.0 >2100 * Contact your local UF County Cooperative Extension Service.
46 Salinity and access to water Most tropical fruit crops are not tolerant of saline soil conditions, saline irrigation water, and salt spray. Exceptions to this are coconut palm and to a limited extent guava. Symptoms of salinity stress include: marginal leaf chlorosis, leaf drop, poor plant vigor/growth tree decline, stem dieback, tree death.
47 Salinity rainfall and irrigation If you have saline water (doubtful, unsuitable): Plant trees away from areas that experience or have experienced salt water intrusion. Find a source of good quality water (municipal water source). Water can be treated but it is expensive. Grow salt tolerant fruit crops. Fertilize trees frequently with small amounts rather than periodic large amounts. Periodically (every 3-6 months) over-irrigated the soil around your trees to flush excess salts from the root zone. Keep water off the leaves when irrigating as the salts in the irrigation water will damage them.
48 For more information Contact your local Master Gardener Trainer, Horticulture, or Agricultural Extension Agent. Visit websites: SolutionsforYourLife EDIS FruitScapes
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