Year: 2010 (Page 23 of 70)

Bug of the Week: Seed Beetles

Ever wondered what makes holes in mesquite pods like these?

seed-beetle-exit-holes

Here’s a hint:

seed-beetles-on-screwbean-mesquite

See those tiny beige beetles feeding on the screwbean mesquite flowers?

seed-beetle

Those are seed beetles. Other common names are pea or bean weevils, although they aren’t really weevils.

When I was in college we called them bruchids, because they belonged to the family Bruchidae. Now they have been moved to the leaf beetle family (Chrysomelidae) and are in the subfamily bruchinae. (Source: BugGuide)

The adult beetles lay their eggs in seeds, often of legumes like mesquite. The larvae are tiny grubs that feed inside the seeds. The larvae pupate, and when the time and conditions are right, the adult beetles chew out leaving a neat round exit hole.

seed-beetle-2

Seed beetles are useful laboratory animals because they require little care.

For example, check out this animal behavior experiment on the movement of seed beetles that investigates whether seed beetles prefer to move horizontally or vertically.

Who knows where studying a tiny beetle can lead…

Mystery Seed of the Week 36

seed-of-the-week

This plant grows only in the Southwest, so I’ll give you a few hints.

mystery-seed-36

When the seed is on the plant it is covered. I have opened the covering here.

mystery-seed-36-2

The seeds are large, about the size of an almond. They are not edible but the plant is useful and is sometimes grown as a crop.

Any guesses?

Edit:  The answer is now posted.

Seed of the Week: Strawberries

Yes, the mystery seeds from last week were from the strawberry plant, genus Fragaria.

strawberries

We see the seeds (technically achenes) all the time, because the plant displays them proudly on the outside of the fruit. But how much have you thought about strawberry seeds?

For example, can you plant strawberry seeds and grow a new strawberry plant?

strawberry-plant

You have probably seen strawberry plants at the nursery. You might even have grown them yourself.

strawberry-plant-good

Although those starter plants are convenient and speed up the arrival of an edible crop, the answer is that you can grow strawberries from seeds.

Our garden strawberries are the result of a cross between two different species of strawberries. Varieties have been developed from those original crosses. Some varieties will grow true to their parents, and others will be a new mix. If you want to be sure to grow reliable strawberries, you can get packets of strawberry seeds from a nursery or online.

But what fun is that? 🙂 Being scientists to the core, we want to find out for ourselves. We have taken some fresh strawberries from the grocery store, blended them in the blender for a few seconds and then spread them on some moist potting mix. We covered the seeds lightly with soil, and will let you know our results.

One question you may have is whether the seeds need a cold period, like apples do. That is one variable we need to examine. One scientific paper I examined suggested that the seeds do not necessarily need a cold treatment.

Source:  An improved technique for the germination of strawberry seeds

Have you ever grown strawberries? (I know someone who left a comment on the mystery seed post grew them commercially). How about from seed? If you give it a try, be sure to let us know what happens.

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