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14

One would expect that the producers of the seed potatoes are going to be better about keeping their product disease free than your average supermarket, but there are no guarantees in life. As to your chances of getting a bad, disease carrying potato from your supermarket, I'd say that depends on how well you trust that supermarket (though I'd guess it's ...


13

I had an entire potato crop get hit by late blight (which didn't come in via the seed potatoes) a couple of years ago. Fortunately I was able to dig the potatoes and dispose of the plants before the tubers were affected -- they were fine to eat -- but I certainly didn't save any of those for planting the following year since they would be blight hosts. How ...


11

This is Fire Blight, a bacterial infection commonly spread by bees and other pollinators. Hence the infection usually starts at the blossoms. It typically extends into the branches and twigs, but is often localized. It can, however spread into the tree (especially a weakened tree). Death is inevitable if the infection reaches the roots. Pears are ...


10

According to notes by the Alabama A&M and Auburn Universities: BER is caused by calcium deficiency, usually induced by fluctuations in the plant's water supply. Because calcium is not a highly mobile element in the plant, even brief fluctuations in the water supply can cause BER. Also, if plants are growing in highly acidic soil or are getting too ...


10

Sounds like Verticillium wilt. Verticillium wilt is a soil-borne fungal disease that results in the yellowing, and eventual browning and death of foliage, particularly in branches closest to the soil. The wilt starts as yellow, V-shaped areas that narrow at the leaf margins. These yellow areas grow over time, turn brown, and then the leaf dies. Often, ...


10

You probably can pinch the lower branches off, and actually help the growth of the plant. Your plant can grow pretty big (4 feet) so to encourage tall growth (and keep the leaves away from the dirt, which probably caused the yellowing) pull them out. If it goes on, pull the plant out (don't compost it) and be thankful it is early in the year. It's ...


9

These are almost certainly parasites called Scale insects which suck the juices out of the stem and leaves and cause the plant to lose vigor. In this case it is a Coccus. Fortunately, you have spotted them early, before your avocado has become infested with them, and they can easily be removed in one of the following ways: Scrape them off with a cotton ...


9

I would have said Blossom End Rot because that seems to be the most rot along these lines., and especially as you have it on a few of the larger fruit. It is caused by a Calcium deficiency. Check your MiracleGro - it is probably almost all NPK but might have Calcium in smaller quantities. Is that enough? I don't know. Usually the problem occurs more due to ...


7

This could also simply be a Nitrogen deficiency. The plant will transfer Nitrogen from the lower, older leaves up to the upper, newer ones if it doesn't have enough available Nitrogen in the soil. Feeding with fish emulsion (There are a few brands, and what your local store has will probably depend on what region you're in: My local Home Depot carries ...


7

The advice not to plant brassicas on the same plot more than once every three years is not unusual; crop rotation is recommended for all vegetables, as nutritional needs and intake vary slightly from one vegetable group to another; therefore, growing the same group on the same plot year after year may deplete the soil of a particular nutrient and lead to ...


6

Mealybugs are only one of over a thousand different varieties of Scale Insects which vary tremendously in appearance, and it is almost certainly one of these that is attacking your palms -see here and here. Scale insects, apart from mealybugs, are mostly sedentary creatures (apparently, the females are usually immobile), and they are difficult to control ...


6

The advice to avoid putting brassica roots into compost is widespread, but not absolute. If you don't have a club root infection, you can compost the roots. This scientific study found that Plasmodiophora brassicae (the club root pathogen) was destroyed when composted in windrows at 54-73°C for 6-7 days with adequate moisture content. My compost sometimes ...


6

I'd hazard an educated guess at bad growing conditions - it looks as if this plant is in a pot, which presumably has drainage holes, sitting inside an outer container which probably does not. Succulents like to be kept on the dry side, preferring well drained conditions - if you've watered that too often, and not emptied the outer pot of all water twice ...


5

Although myself, I buy seed potatoes from a garden centre, I know a lot of seasoned gardeners who buy them from the local food store and, after chitting them, if they are larger than a hen's egg, cut them in half. I would think that the chances of their being diseased or of rotting are minimal. If you want to play it safe, you could let the cut ends dry for ...


5

The burnt/scorched looking leaves could mean a lot of things. My first guess would be over fertilization either at the nursery or by you. Blueberries need acidic soil at a pH level of about 4.5-5. If you used a regular high nitrogen fertilizer, it would be terrible for the plant and the leaves can get "burnt" from the fertilizer. Secondly, blueberries like ...


5

Unfortunately, there is no known cure or treatment for a tree infected with this pathogen, which appears to be a strain of the fungus Fungus oxysporum. It is thought to spread to other palms on the wind and on pruning tools: • Infected palms die quickly, often within a few months of the initial symptoms. • There is no cure once a palm is infected, ...


5

Blossom End Rot is caused by calcium deficiency -- you need to figure out the mechanism that caused the deficiency. It's a physiological problem resulting from the plant's inability to move calcium where it is needed. Have you done a soil test? Does your soil have enough calcium? Do you have too much potassium? (K interferes with Ca uptake.) Is your pH in ...


5

Sclerotinia sclerotiorum can cause stem rot on peony as well as on many different herbaceous plants found in the garden. The entire plant or portion of the plant may wilt. The infected part of the stem turns a light tan color and may become dry and stringy. Fluffy white mycelium often appears under humid conditions, thus the name, white mold. Slice the ...


5

Pretty sure that's Peach Leaf Curl. My tree's were hit by that pretty bad this last year. I spoke with a few people and from what I understand the solution is to apply a fungicide in either late fall (when most of the leaves are gone) or early spring (when they are budding). Something like this I sprayed my tree's down but I haven't had a chance to see ...


5

The last picture clinches it - it's undoubtedly scale. Scale is really hard to get rid of entirely. For most of the lifecycle it's very tiny and impossible to spot all of. It spreads to other plants. It leaves a sticky residue underneath the plant that's hard to remove. So... consider tossing the plant. You can slow it down a lot with organic sprays, ...


5

tomato blossom end rot is caused (generally) by a lack of calcium, sound like you are amending the soil, but in my area, The Great Basin the lack of calcium is caused by too much limestone clay, causing the soil to be so basic that the calcium isn't available (ie too much calcium means too little available to the plant) introduction of organic matter ...


5

This is called mycelium. It's a fungus that breaks down organic material. You'll find it on bits of wood buried in the soil, on rotting straw or woody bits in compost heaps, on leafmould and manure in the soil. They are not harmful and these organisms play a vital part in the ecosystem in breaking down material so plants can use it. It's a good thing when ...


5

There are many possible types of fungi or slime mould that this could be but the cause and treatment are the same. The source is wood which is part of a soil mix that has been inadequately composted or sterilized. The culprit is eating the woody bits in the soil. You cannot control this just by removing the soil as it will be found throughout the soil. ...


5

That is a bad case of spider mites. Check the link to a similar question. The good news is that you can control the situation easily and safely with soap and water and a cloth. Mix up a solution of a teaspoon of dish soap to a quart of water and stir. Soak the cloth in the solution and wipe down every surface of the plant, top and bottom, stems, ...


4

As it turns out, the answer was as Mike Perry suggested in the comments on the question: wait and see. One year after I posted this question, the previously "bad" Lupin is growing and flowering strongly, while the "good" Lupin is a lot smaller than last year, but otherwise looks healthy:


4

There is another option, although it is not widely practiced. Instead of using "seed potatoes" use "potato seed". http://www.curzio.com/N/Potato_starting_from_seed.htm Also, I've had success planting organic potatoes bought at the grocery store that I would have otherwise eaten, but I wouldn't recommend it unless you're having a really hard time finding ...


4

This is almost certainly Powdery Mildew (see Figure 3, here), and a severe attack can weaken a plant considerably. Tomato powdery mildew is apparently caused by two different fungi, Leveillula taurica (Oidiopsis sicula) and by Erysiphe (Oidium lycopersicum), and tomato leaves that are affected by the second variety don't develop any yellow spots; given that ...


4

This looks like Boisduvals scale to me. You can read more here On plants with hard leaves you can take a scrubby to them and physically remove them. However they tend to shelter deep within the root axils and I have never been able to eradicate them with soap and water. As I try to reduce the maintenance I have to do on indoor plants I usually get rid of ...


4

Your photos definitely look like a scale. Some information gleaned from "The Organic Gardener's Handbook of Natural Pest and Disease Control" (Rodale), Bradley et al, eds: Armored Scales are part of the family Diaspididae. As Mancuniensis says, there are a lot of different species here -- over 2650 according to wikipedia. In warm areas (I would presume ...


4

This site describes the tar spot. It does not harm the tree but is unsightly. The causal agent, a fungus, overwinters on the leaves. If your neighbours have maple trees and don't follow rigorous cleanup chances are good cleanup work on your part will not reduce the chance of infection. "Short-term composting of mulches in windrows under ...



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